diff --git a/lisp/ox-md.el b/lisp/ox-md.el
index 1724a4f93..1d20c04f4 100644
--- a/lisp/ox-md.el
+++ b/lisp/ox-md.el
@@ -290,7 +290,7 @@ INFO is a plist used as a communication channel."
   (org-export-data-with-backend datum 'html info))
 
 (defun org-md--identity (_datum contents _info)
-  "Return CONTENTS only"
+  "Return CONTENTS only."
   contents)