diff --git a/AGENTS.md b/AGENTS.md
index 9a4525e..475368f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -9,6 +9,7 @@ This document provides context and best practices for GitHub Copilot when workin
 
 ## Commits
 
+- our default branch is origin/master
 - commit messages are short - one sentence. do not write long articles.
 - pull requests are more verbose and especially give reasoning for changes