diff --git a/puml-mode.el b/puml-mode.el
index 472a444..a231466 100644
--- a/puml-mode.el
+++ b/puml-mode.el
@@ -28,6 +28,7 @@
 
 ;;; Change log:
 ;;
+;; Version 0.6.7, 2016-10-11 Added deprecation warning in favor of plantuml-mode
 ;; version 0.6.6, 2016-07-19 Added autoload, minor bug fixes
 ;; version 0.6.5, 2016-03-24 Added UTF8 support and open in new window / frame shortcuts
 ;; version 0.6.4, 2015-12-12 Added support for comments (single and multiline) -- thanks to https://github.com/nivekuil
@@ -54,7 +55,7 @@
 
 (defvar puml-mode-hook nil "Standard hook for puml-mode.")
 
-(defconst puml-mode-version "0.6.5" "The puml-mode version string.")
+(defconst puml-mode-version "0.6.7" "The puml-mode version string.")
 
 (defvar puml-mode-debug-enabled nil)
 
@@ -120,6 +121,7 @@
 
 (defun puml-init ()
   "Initialize the keywords or builtins from the cmdline language output."
+  (display-warning :warning "`puml-mode' is deprecated in favor of `plantuml-mode', make sure to update your configuration")
   (unless (file-exists-p puml-plantuml-jar-path)
     (error "Could not find plantuml.jar at %s" puml-plantuml-jar-path))
   (with-temp-buffer
@@ -340,7 +342,17 @@ Shortcuts             Command Name
   (set (make-local-variable 'comment-end) "'/")
   (set (make-local-variable 'comment-multi-line) t)
   (set (make-local-variable 'comment-style) 'extra-line)
-  (setq font-lock-defaults '((puml-font-lock-keywords) nil t)))
+  (setq font-lock-defaults '((puml-font-lock-keywords) nil t))
+
+  ; Run hooks:
+  (run-mode-hooks 'puml-mode-hook))
+
+(defun puml-deprecation-warning ()
+  "Warns the user about the deprecation of the `puml-mode' project."
+  (display-warning :warning
+                   "`puml-mode' is now deprecated and no longer updated, you should move your configuration to use `plantuml-mode'. See https://github.com/sytac/plantuml-mode."))
+
+(add-hook 'puml-mode-hook 'puml-deprecation-warning)
 
 (provide 'puml-mode)
 ;;; puml-mode.el ends here