diff --git a/_extensions/wordcount/_extension.yml b/_extensions/wordcount/_extension.yml
index 85bb2f8..9bdf618 100644
--- a/_extensions/wordcount/_extension.yml
+++ b/_extensions/wordcount/_extension.yml
@@ -19,3 +19,4 @@ contributes:
     html: default
     pdf: default
     docx: default
+    markdown: default