diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fc7c805..b1e275c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,6 +36,7 @@ jobs:
   docs:
     name: Documentation
     runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/master'
     steps:
     - uses: actions/checkout@v1
     - name: Build documentation