diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 7bd9d5a9147eb..4042d24f5f452 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 env:
   SCCACHE_GHA_ENABLED: "true"
@@ -38,6 +41,8 @@ jobs:
 
           mkdir artifact
           cp -R target/doc/* artifact
+      - name: Show available storage
+        run: df -h
       - name: Install cargo-docset
         uses: taiki-e/install-action@v2
         with: