diff --git a/site/docs/configuration.md b/site/docs/configuration.md
index ca6ea87e..fa689e3b 100644
--- a/site/docs/configuration.md
+++ b/site/docs/configuration.md
@@ -301,7 +301,7 @@ paginate_path: 'page:num'
 paginate:      nil
 
 markdown:      kramdown
-markdown_ext:  markdown,mkd,mkdn,md
+markdown_ext:  markdown,mkdown,mkdn,mkd,md
 textile_ext:   textile
 
 excerpt_separator: "\n\n"