diff --git a/AGENTS.md b/AGENTS.md
index fdd290b..56ea0db 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -132,6 +132,7 @@ User preference:
 - feature/fix branches must use the prefix `feat/` or `fix/`
 - after finishing work in a `feat/` or `fix/` branch, propose merging it back into `main`
 - comments and commit messages should be written in Russian
+- commit messages should describe what was done, not what should be done
 - if changes affect files that go into the final `.pak`, or change the build/release process, propose releasing the next version
 - if push fails, retry up to two more times with a 3-second pause between attempts