diff --git a/.github/workflows/discoverability.yml b/.github/workflows/discoverability.yml
new file mode 100644
index 00000000000..20ac7c367ee
--- /dev/null
+++ b/.github/workflows/discoverability.yml
@@ -0,0 +1,20 @@
+name: Discoverability
+
+on: pull_request
+
+jobs:
+  discoverability-action:
+    name: Discoverability action
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+
+    - name: yarn
+      run: yarn
+
+    - name: Add a comment with known areas to test
+      uses: shopify/discoverability-action@beta-1
+      with:
+        codebaseGlob: src/**/*.tsx
+        ignoreGlob: src/**/*.test.tsx
+        githubToken: ${{ secrets.GITHUB_TOKEN }}
diff --git a/UNRELEASED.md b/UNRELEASED.md
index 8bc863496dc..c2c510c2268 100644
--- a/UNRELEASED.md
+++ b/UNRELEASED.md
@@ -35,3 +35,7 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 - Added `MediaQueryProvider` to ease the use of media queries and reduce duplication ([#2117](https://github.com/Shopify/polaris-react/pull/2117))
 
 ### Deprecations
+
+### Development workflow
+
+- Added a Github action, [discoverability-action](https://github.com/Shopify/discoverability-action), that runs `yarn splash` on PR diffs and leaves a comment with the output ([#2208](https://github.com/Shopify/polaris-react/pull/2208))