diff --git a/codex/skills/todo-plan/SKILL.md b/codex/skills/todo-plan/SKILL.md
index 3735049..e83e18f 100644
--- a/codex/skills/todo-plan/SKILL.md
+++ b/codex/skills/todo-plan/SKILL.md
@@ -25,6 +25,7 @@ description: "Create and append plan blocks to TODO.md when the user asks for a
 ## Formatting rules
 
 - Use the template below verbatim.
+- Always keep a blank line after the `## Plan: ...` header.
 - Keep existing TODO.md English structure and indentation.
 - Use `[ ]` for each action item line.
 - If notes are not obvious, use `- TBD`.