diff --git a/.github/workflows/docgen.yml b/.github/workflows/docgen.yml
index 56b5780..12e0e8d 100644
--- a/.github/workflows/docgen.yml
+++ b/.github/workflows/docgen.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches-ignore:
       - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build-sources: