diff --git a/_config.yml b/_config.yml
index b44bb09..8f3a3c4 100644
--- a/_config.yml
+++ b/_config.yml
@@ -13,3 +13,7 @@ repository:
   url: https://github.com/AllenDowney/AstronomyDataPython
 html:
   use_repository_button: true
+
+parse:
+  myst_extended_syntax: true
+