diff --git a/.github/workflows/node.yml b/.github/workflows/node.yml
index 8391314..0890262 100644
--- a/.github/workflows/node.yml
+++ b/.github/workflows/node.yml
@@ -1,6 +1,6 @@
 name: Node.js CI
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
diff --git a/.github/workflows/size.yml b/.github/workflows/size.yml
new file mode 100644
index 0000000..b957c53
--- /dev/null
+++ b/.github/workflows/size.yml
@@ -0,0 +1,14 @@
+name: Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: preactjs/compressed-size-action@v2
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          pattern: "{./dist/index.js,./dist/plugins/*.js}"