diff --git a/SKILL.md b/SKILL.md
index d7cab60..f2c1a0e 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -255,6 +255,7 @@ Each pattern entry:
 - Rule (one sentence: "Do X" or "Never Y")
 - Example (real code from the source, not invented)
 - Why (the force that makes this the right choice)
+- When to use (the trigger condition — what situation calls for this)
 - When NOT to use (where the pattern breaks down)
 - Source (file path + line, or commit where it's demonstrated)