diff --git a/README.md b/README.md
index aa9b19fd..fe13ba9e 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ terminal ui (tui) frontend for git written in rust
 * [x] show files on index
 * [x] colorize diff
 * [x] only show diff of selected file
+* [ ] change detection
 * [ ] allow selecting/diff index items
 * [ ] allow scrolling diff
 * [ ] support staging/unstaging
diff --git a/src/app.rs b/src/app.rs
index f729cdae..b8998046 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,6 +1,9 @@
 use crate::git_utils;
+use crate::git_utils::Diff;
+use crate::git_utils::DiffLine;
 use crossterm::event::{Event, KeyCode};
-use git2::{DiffFormat, DiffOptions, Repository, Status};
+use git2::{Repository, Status};
+use git_utils::DiffLineType;
 use std::cmp;
 use std::path::Path;
 use tui::{
@@ -11,29 +14,6 @@ use tui::{
     Frame,
 };
 
-#[derive(Copy, Clone, PartialEq)]
-pub enum DiffLineType {
-    None,
-    Header,
-    Add,
-    Delete,
-}
-
-impl Default for DiffLineType {
-    fn default() -> Self {
-        DiffLineType::None
-    }
-}
-
-#[derive(Default, PartialEq)]
-pub struct DiffLine {
-    content: String,
-    line_type: DiffLineType,
-}
-
-#[derive(Default, PartialEq)]
-pub struct Diff(Vec<DiffLine>);
-
 #[derive(Default)]
 pub struct App {
     status_items: Vec<String>,
@@ -94,7 +74,7 @@ impl App {
     ///
     fn update_diff(&mut self) {
         let new_diff = match self.status_select {
-            Some(i) => get_diff(Path::new(self.status_items[i].as_str())),
+            Some(i) => git_utils::get_diff(Path::new(self.status_items[i].as_str())),
             None => Diff::default(),
         };
 
@@ -147,6 +127,13 @@ impl App {
                         content.into(),
                         Style::default().fg(Color::White).bg(Color::Green),
                     ),
+                    DiffLineType::Header => Text::Styled(
+                        content.into(),
+                        Style::default()
+                            .fg(Color::Black)
+                            .bg(Color::Gray)
+                            .modifier(Modifier::BOLD),
+                    ),
                     _ => Text::Raw(content.into()),
                 }
             })
@@ -219,42 +206,3 @@ fn draw_list<B: Backend, T: AsRef<str>>(
         .highlight_symbol(">")
         .render(f, r);
 }
-
-///
-fn get_diff(p: &Path) -> Diff {
-    let repo = Repository::init("./").unwrap();
-
-    if repo.is_bare() {
-        panic!("bare repo")
-    }
-
-    let mut opt = DiffOptions::new();
-    opt.pathspec(p);
-
-    let diff = repo
-        .diff_index_to_workdir(None, Some(&mut opt))
-        .unwrap();
-
-    let mut res = Vec::new();
-
-    diff.print(DiffFormat::Patch, |_delta, _hunk, line| {
-
-        let line_type = match line.origin() {
-            'H' => DiffLineType::Header,
-            '<' | '-' => DiffLineType::Delete,
-            '>' | '+' => DiffLineType::Add,
-            _ => DiffLineType::None,
-        };
-
-        let diff_line = DiffLine {
-            content: String::from_utf8_lossy(line.content()).to_string(),
-            line_type,
-        };
-
-        res.push(diff_line);
-        true
-    })
-    .unwrap();
-
-    Diff(res)
-}
diff --git a/src/git_utils.rs b/src/git_utils.rs
index 775d3240..79b91475 100644
--- a/src/git_utils.rs
+++ b/src/git_utils.rs
@@ -1,6 +1,77 @@
-use git2::Status;
+use git2::{DiffFormat, DiffOptions, Repository, Status};
+use std::path::Path;
+
+#[derive(Copy, Clone, PartialEq)]
+pub enum DiffLineType {
+    None,
+    Header,
+    Add,
+    Delete,
+}
+
+impl Default for DiffLineType {
+    fn default() -> Self {
+        DiffLineType::None
+    }
+}
+
+#[derive(Default, PartialEq)]
+pub struct DiffLine {
+    pub content: String,
+    pub line_type: DiffLineType,
+}
+
+#[derive(Default, PartialEq)]
+pub struct Diff(pub Vec<DiffLine>);
 
 ///
-pub fn on_index(s:&Status)->bool{
+pub fn get_diff(p: &Path) -> Diff {
+    let repo = Repository::init("./").unwrap();
+
+    if repo.is_bare() {
+        panic!("bare repo")
+    }
+
+    let mut opt = DiffOptions::new();
+    opt.pathspec(p);
+
+    let diff = repo.diff_index_to_workdir(None, Some(&mut opt)).unwrap();
+
+    let mut res = Vec::new();
+
+    diff.print(DiffFormat::Patch, |_delta, _hunk, line| {
+        let origin = line.origin();
+
+        if origin != 'F' {
+            let line_type = match origin {
+                'H' => DiffLineType::Header,
+                '<' | '-' => DiffLineType::Delete,
+                '>' | '+' => DiffLineType::Add,
+                _ => DiffLineType::None,
+            };
+
+            let diff_line = DiffLine {
+                content: String::from_utf8_lossy(line.content()).to_string(),
+                line_type,
+            };
+
+            if line_type == DiffLineType::Header && res.len() > 0 {
+                res.push(DiffLine {
+                    content: "\n".to_string(),
+                    line_type: DiffLineType::None,
+                });
+            }
+
+            res.push(diff_line);
+        }
+        true
+    })
+    .unwrap();
+
+    Diff(res)
+}
+
+///
+pub fn on_index(s: &Status) -> bool {
     s.is_index_new() || s.is_index_modified()
 }