diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87d108e..d682125 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,18 +7,18 @@ The format follows *Keep a Changelog*. Versions use semantic versioning with pre
 ## [v0.5.4] - 2026-03-13
 
 ### Hero Screenshot
-- ![TODO hero screenshot](docs/images/TODO-release-hero.png)
+- ![v0.5.4 hero screenshot](docs/images/ipad-editor-light.png)
 
 ### Why Upgrade
-- TODO
-- TODO
-- TODO
+- Large files now open through a deferred, chunked install path instead of a single blocking first paint.
+- Large-file sessions can switch between `Standard`, `Deferred`, and `Plain Text` modes directly in the editor UI.
+- Status and large-file chrome are clearer, with line counts, session indicators, and better release-state visibility.
 
 ### Highlights
-- TODO
+- Added a dedicated large-file open mode with deferred first paint, chunked text installation, and an optional plain-text session mode for ultra-large documents.
 
 ### Fixes
-- TODO
+- Fixed large-file responsiveness regressions across project-sidebar reopen, tab switching, line-number visibility, status metrics, and large-file editor rendering stability.
 
 ### Breaking changes
 - None.
diff --git a/Neon Vision Editor.xcodeproj/project.pbxproj b/Neon Vision Editor.xcodeproj/project.pbxproj
index d6ce226..f8853d4 100644
--- a/Neon Vision Editor.xcodeproj/project.pbxproj	
+++ b/Neon Vision Editor.xcodeproj/project.pbxproj	
@@ -361,7 +361,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 505;
+				CURRENT_PROJECT_VERSION = 506;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;
@@ -444,7 +444,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 505;
+				CURRENT_PROJECT_VERSION = 506;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;
diff --git a/Neon Vision Editor/UI/PanelsAndHelpers.swift b/Neon Vision Editor/UI/PanelsAndHelpers.swift
index 862eb39..d220031 100644
--- a/Neon Vision Editor/UI/PanelsAndHelpers.swift	
+++ b/Neon Vision Editor/UI/PanelsAndHelpers.swift	
@@ -343,10 +343,10 @@ struct WelcomeTourView: View {
             title: "What’s New in This Release",
             subtitle: "Major changes since v0.5.3:",
             bullets: [
-                "![TODO hero screenshot](docs/images/TODO-release-hero.png)",
-                "TODO",
-                "TODO",
-                "TODO"
+                "![v0.5.4 hero screenshot](docs/images/ipad-editor-light.png)",
+                "Large files now open through a deferred, chunked install path instead of a single blocking first paint.",
+                "You can switch large-file sessions between Standard, Deferred, and Plain Text modes directly in the editor UI.",
+                "Large-file status is clearer with line counts, session indicators, and stability-focused rendering fixes."
             ],
             iconName: "sparkles.rectangle.stack",
             colors: [Color(red: 0.40, green: 0.28, blue: 0.90), Color(red: 0.96, green: 0.46, blue: 0.55)],
diff --git a/README.md b/README.md
index feb2c81..80997b6 100644
--- a/README.md
+++ b/README.md
@@ -614,7 +614,7 @@ Latest stable: **v0.5.4** (2026-03-13)
 
 | Version | Date | Highlights | Fixes | Breaking changes | Migration |
 |---|---|---|---|---|---|
-| [`v0.5.4`](https://github.com/h3pdesign/Neon-Vision-Editor/releases/tag/v0.5.4) | 2026-03-13 | TODO | TODO | None noted | None required |
+| [`v0.5.4`](https://github.com/h3pdesign/Neon-Vision-Editor/releases/tag/v0.5.4) | 2026-03-13 | deferred large-file open mode with chunked install; plain-text large-file session mode; clearer large-file status UI with line counts and session controls | large-file responsiveness regressions across sidebar reopen, tab switching, line-number visibility, and rendering stability | None noted | None required |
 | [`v0.5.3`](https://github.com/h3pdesign/Neon-Vision-Editor/releases/tag/v0.5.3) | 2026-03-10 | a new high-readability colorful light theme preset: `Prism Daylight` (also selectable while app appearance is set to dark); double-click-to-close behavior for tabs on macOS tab strips; custom theme vibrancy by applying the vivid neon syntax profile to `Custom`, so syntax colors remain bright and saturated | toolbar-symbol contrast edge cases in dark mode where gray/black variants could appear too similar | None noted | None required |
 | [`v0.5.2`](https://github.com/h3pdesign/Neon-Vision-Editor/releases/tag/v0.5.2) | 2026-03-09 | editor performance presets in Settings (`Balanced`, `Large Files`, `Battery`) with shared runtime mapping; configurable project navigator placement (`Left`/`Right`) for project-structure sidebar layout; iOS/iPadOS large-file responsiveness by lowering automatic large-file thresholds and applying preset-based tuning | missing diagnostics reset workflow by adding a dedicated `Clear Diagnostics` action that also clears file-open timing snapshots; macOS editor-window top-bar jumping when toggling the toolbar translucency control by keeping chrome flags stable; CSV/TSV mode header transparency so the mode bar now uses a solid standard window background | None noted | None required |