diff --git a/.github/workflows/sizeup.yaml b/.github/workflows/sizeup.yaml
new file mode 100644
index 0000000..05df43b
--- /dev/null
+++ b/.github/workflows/sizeup.yaml
@@ -0,0 +1,22 @@
+name: SizeUp
+
+on: pull_request
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  sizeup:
+    name: Estimate reviewability
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Estimate pull request reviewability
+        uses: lerebear/sizeup-action@v0.8.2
+        id: sizeup-action
+        with:
+          token: "${{ secrets.GITHUB_TOKEN }}"
+          # Uncomment line below to use custom sizeup-action configuration.
+          # configuration-file-path: ".github/workflows/sizeup/config.yaml"