diff --git a/book/features/teachbooks_intro.md b/book/features/teachbooks_intro.md
index 7d3dff1..a7c0eb3 100644
--- a/book/features/teachbooks_intro.md
+++ b/book/features/teachbooks_intro.md
@@ -1,7 +1,7 @@
 
 ````{margin}
 
-```{topic}
+```{topic} Feature type
 
 {bdg-link-secondary}`Python Package: TeachBooks`