diff --git a/.claude/skills/releasenote-generator/SKILL.md b/.claude/skills/releasenote-generator/SKILL.md
index e6e0c53..56ba439 100644
--- a/.claude/skills/releasenote-generator/SKILL.md
+++ b/.claude/skills/releasenote-generator/SKILL.md
@@ -10,6 +10,7 @@ allowed-tools:
   - Bash(gh api:*)
 disable-model-invocation: true
 user-invocable: true
+argument-hint: GitHub Pull Request URL
 ---
 
 # Release Note Generator