diff --git a/puml-mode.el b/puml-mode.el
index ff7d429..a94e38a 100644
--- a/puml-mode.el
+++ b/puml-mode.el
@@ -7,6 +7,7 @@
 ;; Maintainer: Carlo Sciolla (skuro)
 ;; Keywords: uml plantuml ascii
 ;; Version: 0.6.5
+;; Package-Requires: ((emacs "24"))
 
 ;; You can redistribute this program and/or modify it under the terms
 ;; of the GNU General Public License as published by the Free Software