diff --git a/_config.yml b/_config.yml
index 7f6ecf96b189f6a10c06f4e500011cf2f3538921..5551522fae5a369cb125b40acf2b51971001eb5c 100644
--- a/_config.yml
+++ b/_config.yml
@@ -39,7 +39,7 @@ plugins:
   - jekyll-feed
 
 kramdown:
-  toc_levels: 2..3  # Generates ToC for H2 and H3 headers
+  toc_levels: 2  # Generates ToC for H2 and H3 headers
 
 # Exclude from processing.
 # The following items will not be processed, by default.