diff --git a/Cargo.lock b/Cargo.lock
index d238ba77..39f4d868 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -293,8 +293,7 @@ dependencies = [
 [[package]]
 name = "git2"
 version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef222034f2069cfc5af01ce423574d3d9a3925bd4052912a14e5bcfd7ca9e47a"
+source = "git+https://github.com/rust-lang/git2-rs.git?rev=617499d7fcf315cf92faa1ffde425666d3edd500#617499d7fcf315cf92faa1ffde425666d3edd500"
 dependencies = [
  "bitflags",
  "libc",
@@ -404,8 +403,7 @@ checksum = "dea0c0405123bba743ee3f91f49b1c7cfb684eef0da0a50110f758ccf24cdff0"
 [[package]]
 name = "libgit2-sys"
 version = "0.12.2+1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a12c878ccc1a49ff71e264233a66d2114cdcc7fdc44c0ebe2b54075240831238"
+source = "git+https://github.com/rust-lang/git2-rs.git?rev=617499d7fcf315cf92faa1ffde425666d3edd500#617499d7fcf315cf92faa1ffde425666d3edd500"
 dependencies = [
  "cc",
  "libc",
diff --git a/Makefile b/Makefile
index ff1d5109..961ee9db 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,9 @@
 debug:
 	GITUI_LOGGING=true cargo run --features=timing
 
+build-release:
+	cargo build --release
+
 test:
 	cargo test --workspace
 
diff --git a/README.md b/README.md
index 9755cb5b..881f7fb9 100644
--- a/README.md
+++ b/README.md
@@ -56,10 +56,8 @@ to enable logging to `~/.gitui/gitui.log`:
 GITUI_LOGGING=true gitui
 ```
 
-# todo for 0.1 (first release)
+# todo for 0.2 (first release)
 
-* [ ] make staging/unstaging async
-* [ ] (un)staging selected hunks
 * [ ] publish as homebrew-tap
 
 # inspiration
diff --git a/asyncgit/Cargo.toml b/asyncgit/Cargo.toml
index bd805283..8202507a 100644
--- a/asyncgit/Cargo.toml
+++ b/asyncgit/Cargo.toml
@@ -10,7 +10,8 @@ license = "MIT"
 categories = ["concurrency","asynchronous"]
 
 [dependencies]
-git2 = "0.13"
+# git2 = "0.13"
+git2 = { git = "https://github.com/rust-lang/git2-rs.git", rev = "617499d7fcf315cf92faa1ffde425666d3edd500" }
 rayon-core = "1.7"
 crossbeam-channel = "0.4"
 log = "0.4"
diff --git a/asyncgit/src/diff.rs b/asyncgit/src/diff.rs
index 07d60445..1c45e05c 100644
--- a/asyncgit/src/diff.rs
+++ b/asyncgit/src/diff.rs
@@ -1,4 +1,4 @@
-use crate::{hash, sync, AsyncNotification, Diff, CWD};
+use crate::{hash, sync, AsyncNotification, FileDiff, CWD};
 use crossbeam_channel::Sender;
 use log::trace;
 use std::{
@@ -21,8 +21,8 @@ struct LastResult<P, R> {
 
 ///
 pub struct AsyncDiff {
-    current: Arc<Mutex<Request<u64, Diff>>>,
-    last: Arc<Mutex<Option<LastResult<DiffParams, Diff>>>>,
+    current: Arc<Mutex<Request<u64, FileDiff>>>,
+    last: Arc<Mutex<Option<LastResult<DiffParams, FileDiff>>>>,
     sender: Sender<AsyncNotification>,
 }
 
@@ -37,7 +37,7 @@ impl AsyncDiff {
     }
 
     ///
-    pub fn last(&mut self) -> Option<Diff> {
+    pub fn last(&mut self) -> Option<FileDiff> {
         let last = self.last.lock().unwrap();
         if let Some(res) = last.clone() {
             Some(res.result)
@@ -55,7 +55,10 @@ impl AsyncDiff {
     }
 
     ///
-    pub fn request(&mut self, params: DiffParams) -> Option<Diff> {
+    pub fn request(
+        &mut self,
+        params: DiffParams,
+    ) -> Option<FileDiff> {
         trace!("request");
 
         let hash = hash(&params);
diff --git a/asyncgit/src/lib.rs b/asyncgit/src/lib.rs
index 29e28263..c1705813 100644
--- a/asyncgit/src/lib.rs
+++ b/asyncgit/src/lib.rs
@@ -12,7 +12,7 @@ pub use crate::{
     diff::{AsyncDiff, DiffParams},
     status::AsyncStatus,
     sync::{
-        diff::{Diff, DiffLine, DiffLineType},
+        diff::{DiffLine, DiffLineType, FileDiff},
         status::{StatusItem, StatusItemType},
         utils::is_repo,
     },
diff --git a/asyncgit/src/sync/diff.rs b/asyncgit/src/sync/diff.rs
index c8664c92..4b37719a 100644
--- a/asyncgit/src/sync/diff.rs
+++ b/asyncgit/src/sync/diff.rs
@@ -1,8 +1,10 @@
 //! sync git api for fetching a diff
 
 use super::utils;
+use crate::hash;
 use git2::{
-    Delta, DiffDelta, DiffFormat, DiffHunk, DiffOptions, Patch,
+    Delta, Diff, DiffDelta, DiffFormat, DiffHunk, DiffOptions, Patch,
+    Repository,
 };
 use scopetime::scope_time;
 use std::{fs, path::Path};
@@ -35,9 +37,8 @@ pub struct DiffLine {
     pub line_type: DiffLineType,
 }
 
-///
-#[derive(Default, Clone, Copy, PartialEq)]
-struct HunkHeader {
+#[derive(Debug, Default, Clone, Copy, PartialEq, Hash)]
+pub(crate) struct HunkHeader {
     old_start: u32,
     old_lines: u32,
     new_start: u32,
@@ -57,20 +58,31 @@ impl From<DiffHunk<'_>> for HunkHeader {
 
 ///
 #[derive(Default, Clone, Hash)]
-pub struct Hunk(pub Vec<DiffLine>);
+pub struct Hunk {
+    ///
+    pub header_hash: u64,
+    ///
+    pub lines: Vec<DiffLine>,
+}
 
 ///
 #[derive(Default, Clone, Hash)]
-pub struct Diff(pub Vec<Hunk>, pub u16);
-
-///
-pub fn get_diff(repo_path: &str, p: String, stage: bool) -> Diff {
-    scope_time!("get_diff");
-
-    let repo = utils::repo(repo_path);
+pub struct FileDiff {
+    /// list of hunks
+    pub hunks: Vec<Hunk>,
+    /// lines total summed up over hunks
+    pub lines: u16,
+}
 
+pub(crate) fn get_diff_raw<'a>(
+    repo: &'a Repository,
+    p: &str,
+    stage: bool,
+    reverse: bool,
+) -> (Diff<'a>, DiffOptions) {
     let mut opt = DiffOptions::new();
     opt.pathspec(p);
+    opt.reverse(reverse);
 
     let diff = if stage {
         // diff against head
@@ -98,13 +110,27 @@ pub fn get_diff(repo_path: &str, p: String, stage: bool) -> Diff {
         repo.diff_index_to_workdir(None, Some(&mut opt)).unwrap()
     };
 
-    let mut res: Diff = Diff::default();
+    (diff, opt)
+}
+
+///
+pub fn get_diff(repo_path: &str, p: String, stage: bool) -> FileDiff {
+    scope_time!("get_diff");
+
+    let repo = utils::repo(repo_path);
+
+    let (diff, mut opt) = get_diff_raw(&repo, &p, stage, false);
+
+    let mut res: FileDiff = FileDiff::default();
     let mut current_lines = Vec::new();
     let mut current_hunk: Option<HunkHeader> = None;
 
-    let mut adder = |lines: &Vec<DiffLine>| {
-        res.0.push(Hunk(lines.clone()));
-        res.1 += lines.len() as u16;
+    let mut adder = |header: &HunkHeader, lines: &Vec<DiffLine>| {
+        res.hunks.push(Hunk {
+            header_hash: hash(header),
+            lines: lines.clone(),
+        });
+        res.lines += lines.len() as u16;
     };
 
     let mut put = |hunk: Option<DiffHunk>, line: git2::DiffLine| {
@@ -114,7 +140,7 @@ pub fn get_diff(repo_path: &str, p: String, stage: bool) -> Diff {
             match current_hunk {
                 None => current_hunk = Some(hunk_header),
                 Some(h) if h != hunk_header => {
-                    adder(&current_lines);
+                    adder(&h, &current_lines);
                     current_lines.clear();
                     current_hunk = Some(hunk_header)
                 }
@@ -184,7 +210,7 @@ pub fn get_diff(repo_path: &str, p: String, stage: bool) -> Diff {
     }
 
     if !current_lines.is_empty() {
-        adder(&current_lines);
+        adder(&current_hunk.unwrap(), &current_lines);
     }
 
     res
@@ -243,8 +269,8 @@ mod tests {
         let diff =
             get_diff(repo_path, "foo/bar.txt".to_string(), false);
 
-        assert_eq!(diff.0.len(), 1);
-        assert_eq!(diff.0[0].0[1].content, "test\n");
+        assert_eq!(diff.hunks.len(), 1);
+        assert_eq!(diff.hunks[0].lines[1].content, "test\n");
     }
 
     #[test]
@@ -270,7 +296,7 @@ mod tests {
             true,
         );
 
-        assert_eq!(diff.0.len(), 1);
+        assert_eq!(diff.hunks.len(), 1);
     }
 
     static HUNK_A: &str = r"
@@ -345,6 +371,6 @@ mod tests {
 
         let res = get_diff(repo_path, "bar.txt".to_string(), false);
 
-        assert_eq!(res.0.len(), 2)
+        assert_eq!(res.hunks.len(), 2)
     }
 }
diff --git a/asyncgit/src/sync/hunks.rs b/asyncgit/src/sync/hunks.rs
new file mode 100644
index 00000000..3fdda32e
--- /dev/null
+++ b/asyncgit/src/sync/hunks.rs
@@ -0,0 +1,108 @@
+use super::{
+    diff::{get_diff_raw, HunkHeader},
+    utils::repo,
+};
+use crate::hash;
+use git2::{ApplyLocation, ApplyOptions, Diff};
+use log::error;
+use scopetime::scope_time;
+
+///
+pub fn stage_hunk(
+    repo_path: &str,
+    file_path: String,
+    hunk_hash: u64,
+) -> bool {
+    scope_time!("stage_hunk");
+
+    let repo = repo(repo_path);
+
+    let (diff, _) = get_diff_raw(&repo, &file_path, false, false);
+
+    let mut opt = ApplyOptions::new();
+    opt.hunk_callback(|hunk| {
+        let header = HunkHeader::from(hunk.unwrap());
+        hash(&header) == hunk_hash
+    });
+
+    repo.apply(&diff, ApplyLocation::Index, Some(&mut opt))
+        .is_ok()
+}
+
+fn find_hunk_index(diff: &Diff, hunk_hash: u64) -> Option<usize> {
+    let mut result = None;
+
+    let mut hunk_count = 0;
+
+    let foreach_result = diff.foreach(
+        &mut |_, _| true,
+        None,
+        Some(&mut |_, hunk| {
+            let header = HunkHeader::from(hunk);
+            if hash(&header) == hunk_hash {
+                result = Some(hunk_count);
+            }
+            hunk_count += 1;
+            true
+        }),
+        None,
+    );
+
+    if foreach_result.is_ok() {
+        result
+    } else {
+        None
+    }
+}
+
+///
+pub fn revert_hunk(
+    repo_path: &str,
+    file_path: String,
+    hunk_hash: u64,
+) -> bool {
+    scope_time!("revert_hunk");
+
+    let repo = repo(repo_path);
+
+    let (diff, _) = get_diff_raw(&repo, &file_path, true, false);
+    let diff_count_positive = diff.deltas().len();
+
+    let hunk_index = find_hunk_index(&diff, hunk_hash);
+
+    if hunk_index.is_none() {
+        error!("hunk not found");
+        return false;
+    }
+
+    let (diff, _) = get_diff_raw(&repo, &file_path, true, true);
+
+    assert_eq!(diff.deltas().len(), diff_count_positive);
+
+    let mut count = 0;
+    {
+        let mut hunk_idx = 0;
+        let mut opt = ApplyOptions::new();
+        opt.hunk_callback(|_hunk| {
+            let res = if hunk_idx == hunk_index.unwrap() {
+                count += 1;
+                true
+            } else {
+                false
+            };
+
+            hunk_idx += 1;
+
+            res
+        });
+        if repo
+            .apply(&diff, ApplyLocation::Index, Some(&mut opt))
+            .is_err()
+        {
+            error!("apply failed");
+            return false;
+        }
+    }
+
+    count == 1
+}
diff --git a/asyncgit/src/sync/mod.rs b/asyncgit/src/sync/mod.rs
index c1779406..b35f4b8f 100644
--- a/asyncgit/src/sync/mod.rs
+++ b/asyncgit/src/sync/mod.rs
@@ -1,10 +1,12 @@
 //! sync git api
 
 pub mod diff;
+mod hunks;
 mod reset;
 pub mod status;
 pub mod utils;
 
+pub use hunks::{revert_hunk, stage_hunk};
 pub use reset::{reset_stage, reset_workdir};
 pub use utils::{commit, stage_add};
 
diff --git a/src/app.rs b/src/app.rs
index fe4f809c..3bf613a9 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -82,7 +82,7 @@ impl App {
                 false,
                 queue.clone(),
             ),
-            diff: DiffComponent::default(),
+            diff: DiffComponent::new(queue.clone()),
             git_diff: AsyncDiff::new(sender.clone()),
             git_status: AsyncStatus::new(sender),
             current_commands: Vec::new(),
@@ -216,13 +216,7 @@ impl App {
 // private impls
 impl App {
     fn update_diff(&mut self) {
-        let (idx, is_stage) = match self.diff_target {
-            DiffTarget::Stage => (&self.index, true),
-            DiffTarget::WorkingDir => (&self.index_wd, false),
-        };
-
-        if let Some(i) = idx.selection() {
-            let path = i.path;
+        if let Some((path, is_stage)) = self.selected_path() {
             let diff_params = DiffParams(path.clone(), is_stage);
 
             if self.diff.current() == (path.clone(), is_stage) {
@@ -245,6 +239,19 @@ impl App {
         }
     }
 
+    fn selected_path(&self) -> Option<(String, bool)> {
+        let (idx, is_stage) = match self.diff_target {
+            DiffTarget::Stage => (&self.index, true),
+            DiffTarget::WorkingDir => (&self.index_wd, false),
+        };
+
+        if let Some(i) = idx.selection() {
+            Some((i.path, is_stage))
+        } else {
+            None
+        }
+    }
+
     fn update_commands(&mut self) {
         self.help.set_cmds(self.commands(true));
         self.current_commands = self.commands(false);
@@ -284,6 +291,17 @@ impl App {
                 self.reset.open_for_path(p);
                 self.update_commands();
             }
+            InternalEvent::AddHunk(hash) => {
+                if let Some((path, is_stage)) = self.selected_path() {
+                    if is_stage {
+                        if sync::revert_hunk(CWD, path, *hash) {
+                            self.update();
+                        }
+                    } else if sync::stage_hunk(CWD, path, *hash) {
+                        self.update();
+                    }
+                }
+            }
         };
     }
 
diff --git a/src/components/diff.rs b/src/components/diff.rs
index 705f5eb9..829ac44d 100644
--- a/src/components/diff.rs
+++ b/src/components/diff.rs
@@ -1,9 +1,10 @@
 use super::{CommandBlocking, DrawableComponent, EventUpdate};
 use crate::{
     components::{CommandInfo, Component},
+    queue::{InternalEvent, Queue},
     strings,
 };
-use asyncgit::{hash, Diff, DiffLine, DiffLineType};
+use asyncgit::{hash, DiffLine, DiffLineType, FileDiff};
 use crossterm::event::{Event, KeyCode};
 use std::{borrow::Cow, cmp, convert::TryFrom};
 use strings::commands;
@@ -16,57 +17,113 @@ use tui::{
     Frame,
 };
 
-///
 #[derive(Default)]
+struct Current {
+    path: String,
+    is_stage: bool,
+    hash: u64,
+}
+
+///
 pub struct DiffComponent {
-    diff: Diff,
+    diff: FileDiff,
     scroll: u16,
     focused: bool,
-    current: (String, bool),
-    current_hash: u64,
+    current: Current,
+    selected_hunk: Option<u16>,
+    queue: Queue,
 }
 
 impl DiffComponent {
+    ///
+    pub fn new(queue: Queue) -> Self {
+        Self {
+            focused: false,
+            queue,
+            current: Current::default(),
+            selected_hunk: None,
+            diff: FileDiff::default(),
+            scroll: 0,
+        }
+    }
     ///
     fn can_scroll(&self) -> bool {
-        self.diff.1 > 1
+        self.diff.lines > 1
     }
     ///
     pub fn current(&self) -> (String, bool) {
-        (self.current.0.clone(), self.current.1)
+        (self.current.path.clone(), self.current.is_stage)
     }
     ///
     pub fn clear(&mut self) {
-        self.current.0.clear();
-        self.diff = Diff::default();
-        self.current_hash = 0;
+        self.current = Current::default();
+        self.diff = FileDiff::default();
+        self.scroll = 0;
+
+        self.selected_hunk =
+            Self::find_selected_hunk(&self.diff, self.scroll);
     }
     ///
     pub fn update(
         &mut self,
         path: String,
         is_stage: bool,
-        diff: Diff,
+        diff: FileDiff,
     ) {
         let hash = hash(&diff);
 
-        if self.current_hash != hash {
-            self.current = (path, is_stage);
-            self.current_hash = hash;
+        if self.current.hash != hash {
+            self.current = Current {
+                path,
+                is_stage,
+                hash,
+            };
             self.diff = diff;
             self.scroll = 0;
+
+            self.selected_hunk =
+                Self::find_selected_hunk(&self.diff, self.scroll);
         }
     }
 
     fn scroll(&mut self, inc: bool) {
+        let old = self.scroll;
         if inc {
             self.scroll = cmp::min(
-                self.diff.1.saturating_sub(1),
+                self.diff.lines.saturating_sub(1),
                 self.scroll.saturating_add(1),
             );
         } else {
             self.scroll = self.scroll.saturating_sub(1);
         }
+
+        if old != self.scroll {
+            self.selected_hunk =
+                Self::find_selected_hunk(&self.diff, self.scroll);
+        }
+    }
+
+    fn find_selected_hunk(
+        diff: &FileDiff,
+        line_selected: u16,
+    ) -> Option<u16> {
+        let mut line_cursor = 0_u16;
+        for (i, hunk) in diff.hunks.iter().enumerate() {
+            let hunk_len = u16::try_from(hunk.lines.len()).unwrap();
+            let hunk_min = line_cursor;
+            let hunk_max = line_cursor + hunk_len;
+
+            let hunk_selected =
+                hunk_min <= line_selected && hunk_max > line_selected;
+
+            if hunk_selected {
+                return Some(u16::try_from(i).unwrap());
+            }
+
+            line_cursor += hunk_len;
+        }
+
+        None
     }
 
     fn get_text(&self, width: u16, height: u16) -> Vec<Text> {
@@ -79,19 +136,21 @@ impl DiffComponent {
         let mut line_cursor = 0_u16;
         let mut lines_added = 0_u16;
 
-        for hunk in &self.diff.0 {
+        for (i, hunk) in self.diff.hunks.iter().enumerate() {
+            let hunk_selected = self
+                .selected_hunk
+                .map_or(false, |s| s == u16::try_from(i).unwrap());
+
             if lines_added >= height {
                 break;
             }
 
-            let hunk_len = u16::try_from(hunk.0.len()).unwrap();
+            let hunk_len = u16::try_from(hunk.lines.len()).unwrap();
             let hunk_min = line_cursor;
             let hunk_max = line_cursor + hunk_len;
 
             if Self::hunk_visible(hunk_min, hunk_max, min, max) {
-                let hunk_selected =
-                    hunk_min <= selection && hunk_max > selection;
-                for (i, line) in hunk.0.iter().enumerate() {
+                for (i, line) in hunk.lines.iter().enumerate() {
                     if line_cursor >= min {
                         Self::add_line(
                             &mut res,
@@ -219,6 +278,17 @@ impl DiffComponent {
 
         false
     }
+
+    fn add_hunk(&self) {
+        if let Some(hunk) = self.selected_hunk {
+            let hash = self.diff.hunks
+                [usize::try_from(hunk).unwrap()]
+            .header_hash;
+            self.queue
+                .borrow_mut()
+                .push_back(InternalEvent::AddHunk(hash));
+        }
+    }
 }
 
 impl DrawableComponent for DiffComponent {
@@ -255,6 +325,18 @@ impl Component for DiffComponent {
             self.focused,
         ));
 
+        let cmd_text = if self.current.is_stage {
+            commands::DIFF_HUNK_ADD
+        } else {
+            commands::DIFF_HUNK_REMOVE
+        };
+
+        out.push(CommandInfo::new(
+            cmd_text,
+            self.selected_hunk.is_some(),
+            self.focused,
+        ));
+
         CommandBlocking::PassingOn
     }
 
@@ -270,6 +352,10 @@ impl Component for DiffComponent {
                         self.scroll(false);
                         Some(EventUpdate::None)
                     }
+                    KeyCode::Enter => {
+                        self.add_hunk();
+                        Some(EventUpdate::None)
+                    }
                     _ => None,
                 };
             }
diff --git a/src/queue.rs b/src/queue.rs
index 3f570a1a..62d9d5d3 100644
--- a/src/queue.rs
+++ b/src/queue.rs
@@ -6,6 +6,8 @@ pub enum InternalEvent {
     ConfirmResetFile(String),
     ///
     ResetFile(String),
+    ///
+    AddHunk(u64),
 }
 
 ///
diff --git a/src/strings.rs b/src/strings.rs
index 91572b4b..82518e59 100644
--- a/src/strings.rs
+++ b/src/strings.rs
@@ -18,6 +18,7 @@ pub mod commands {
     use crate::components::CommandText;
 
     static CMD_GROUP_GENERAL: &str = "General";
+    static CMD_GROUP_DIFF: &str = "Diff";
     static CMD_GROUP_CHANGES: &str = "Changes";
     static CMD_GROUP_COMMIT: &str = "Commit";
 
@@ -34,6 +35,18 @@ pub mod commands {
         CMD_GROUP_GENERAL,
     );
     ///
+    pub static DIFF_HUNK_ADD: CommandText = CommandText::new(
+        "Add hunk [enter]",
+        "adds selected hunk to stage",
+        CMD_GROUP_DIFF,
+    );
+    ///
+    pub static DIFF_HUNK_REMOVE: CommandText = CommandText::new(
+        "Remove hunk [enter]",
+        "removes selected hunk from stage",
+        CMD_GROUP_DIFF,
+    );
+    ///
     pub static CLOSE_POPUP: CommandText = CommandText::new(
         "Close [esc]",
         "close overlay (e.g commit, help)",