diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..67d0740
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,42 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+  schedule:
+    - cron: "0 22 * * 5"
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ javascript, python ]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          languages: ${{ matrix.language }}
+          queries: +security-and-quality
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v2
+        if: ${{ matrix.language == 'javascript' || matrix.language == 'python' }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v2
+        with:
+          category: "/language:${{ matrix.language }}"
diff --git a/extensions.rst b/extensions.rst
index 3564404..15e44bd 100644
--- a/extensions.rst
+++ b/extensions.rst
@@ -114,7 +114,7 @@ which is rendered as
 Recent versions of Sphinx include built-in support for math.
 There are three flavors:
 
-  - sphinx.ext.pngmath: uses dvipng to render the equation
+  - sphinx.ext.imgmath: uses dvipng to render the equation
 
   - sphinx.ext.mathjax: renders the math in the browser using Javascript