diff --git a/.github/workflows/idlelib-help-regen.yml b/.github/workflows/idlelib-help-regen.yml
new file mode 100644
index 00000000000000..c6c9efa73fabe7
--- /dev/null
+++ b/.github/workflows/idlelib-help-regen.yml
@@ -0,0 +1,28 @@
+name: Check Lib/idlelib/help.html is up to date
+
+on:
+  push:
+    paths:
+      - "Doc/library/idle.rst"
+
+jobs:
+  check-help-html:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3'
+      - name: Build and copy
+        run: |
+          cd Doc
+          make venv
+          make html
+          cd ..
+          python -c "from Lib.idlelib.help import copy_strip; copy_strip()"
+      - run: |
+          if ! git diff --quiet Lib/idlelib/help.html; then
+            exit 1
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index fabea611e0ebcd..37af3dde62243c 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -19,6 +19,21 @@ IDLE --- Python editor and shell
 
 IDLE is Python's Integrated Development and Learning Environment.
 
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
+
 IDLE has the following features:
 
 * cross-platform: works mostly the same on Windows, Unix, and macOS