Deprecate master branch
diff --git a/README.md b/README.md
index 0c503d2..8fa006d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+**Do not use this branch, use main branch instead**
+
 # Chrome/Chromium behavior theme for Gerrit
 
 ## To run unit tests