diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 18a2cdae..f4c5cda8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,6 +64,13 @@ jobs:
         with:
           name: execution-reports
           path: _build/html/reports
+      - name: Check for Python warnings (PR mode = changed files)
+        if: github.event_name == 'pull_request'
+        uses: QuantEcon/meta/.github/actions/check-warnings@copilot/fix-224
+        with:
+          html-path: './_build/html'
+          pr-mode: 'true'
+          fail-on-warning: 'true'
       - name: Preview Deploy to Netlify
         uses: nwtgck/actions-netlify@v3
         with:
diff --git a/lectures/about_py.md b/lectures/about_py.md
index 4f9c883c..db22cc0f 100644
--- a/lectures/about_py.md
+++ b/lectures/about_py.md
@@ -29,6 +29,11 @@ anymore. Sorry, R people. I used to be one of you but we no longer descend
 into R." -- Chris Wiggins
 ```
 
+```{code-cell} python3
+import warnings
+warnings.warn("Forced Syntax Warning for Debug.", SyntaxWarning)
+```
+
 ## Overview
 
 This lecture series will teach you to use Python for scientific computing, with