diff --git a/AGENTS.md b/AGENTS.md
index f4751b7..4baa410 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -95,6 +95,7 @@ CHECK syntax before committing
 USE clear and concise commit messages (follow conventional commits if possible)
 NEVER set the git identity
 NEVER add Co-authored-by trailers
+KEEP commit messages brief — no long descriptions if message is self-explanatory
 KEEP diffs minimal
 ENSURE small, verifiable commits