diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
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+# Copilot Instructions
+
+This file provides guidance for GitHub Copilot when working in this repository.
+
+## VS Code Agent Configuration
+
+The table below explains the key fields used when configuring a VS Code Copilot agent persona:
+
+| Line | What it means | Why it matters |
+| --- | --- | --- |
+| `description:` | A label so VS Code knows what this file does | Copilot reads this to understand the agent's role |
+| `applyTo: '**'` | Apply this persona to **every file** (`**` = wildcard = all files) | Without this, the reviewer only works on specific files |
diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 ## Usage
 
 | Action | How |
-|---|---|
+| --- | --- |
 | New note | Click **+** in the sidebar or press `Ctrl+N` |
 | Edit note | Click a note in the list, type in the editor |
 | Delete note | Click **🗑 Delete** in the toolbar, confirm prompt |