diff --git a/markdown-preview-mode.el b/markdown-preview-mode.el
index 0c619bc..1cac2f9 100644
--- a/markdown-preview-mode.el
+++ b/markdown-preview-mode.el
@@ -36,10 +36,10 @@
 (defvar mdpm:websocket-server nil)
 (defvar mdpm:local-client nil)
 (defvar mdpm:remote-clients nil)
-(defvar mdpm:directory (file-name-directory load-file-name))
+(defvar mdpm:preview-url (concat (file-name-directory load-file-name) "preview.html"))
 
 (defun mdpm:open-browser-preview ()
-  (browse-url (concat mdpm:directory "preview.html")))
+  (browse-url mdpm:preview-url))
 
 (defun mdpm:stop-websocket-server ()
   (when mdpm:local-client
diff --git a/markdown-preview-mode.rcp b/markdown-preview-mode.rcp
new file mode 100644
index 0000000..f25e242
--- /dev/null
+++ b/markdown-preview-mode.rcp
@@ -0,0 +1,5 @@
+(:name markdown-preview-mode
+       :description "Markdown preview mode with websocket.el"
+       :type github
+       :website "https://github.com/ancane/markdown-preview-mode.git"
+       :pkgname "ancane/markdown-preview-mode")