diff --git a/pyguide.md b/pyguide.md
index 6a9674c..cd6dfb5 100644
--- a/pyguide.md
+++ b/pyguide.md
@@ -6,9 +6,10 @@ See README.md for details.
 
 # Google Python Style Guide
 
-<!-- https://github.com/google/styleguide/issues/566: Can this render properly on Github Pages? -->
 
-<details>
+<!-- markdown="1" is required for GitHub Pages to render the TOC properly. -->
+
+<details markdown="1">
   <summary>Table of Contents</summary>
 
 -   [1 Background](#s1-background)