diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 983af5a..1545f75 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -1,4 +1,7 @@
-on: [push]
+on:
+  push:
+    branches:
+      - master
 
 name: CI