diff --git a/.github/workflows/mkdocs.yml b/.github/workflows/mkdocs.yml
index 70f8da9a..46a4ec0d 100644
--- a/.github/workflows/mkdocs.yml
+++ b/.github/workflows/mkdocs.yml
@@ -5,7 +5,7 @@ on:
       - 'docs/**'
       - mkdocs.yml
   pull_request:
-    branches: main
+    branches: [main, master]
     paths:
       - 'docs/**'
       - mkdocs.yml