diff --git a/.github/workflows/main.yml b/.github/workflows/size.yml
similarity index 62%
rename from .github/workflows/main.yml
rename to .github/workflows/size.yml
index 5bb07f0167..f886534cc8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/size.yml
@@ -1,15 +1,17 @@
 name: Compressed Size
 
-on: [pull_request]
+on:
+  pull_request:
+    branches:
+      - '**'
+    paths:
+      - '**/src/**.js'
 
 jobs:
   build:
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v2-beta
-        with:
-          fetch-depth: 1
+      - uses: actions/checkout@v2
       - uses: preactjs/compressed-size-action@v1
         with:
           repo-token: '${{ secrets.GITHUB_TOKEN }}'