diff --git a/markdown-preview-mode.rcp b/markdown-preview-mode.rcp
index f25e242..6a2a163 100644
--- a/markdown-preview-mode.rcp
+++ b/markdown-preview-mode.rcp
@@ -1,5 +1,6 @@
 (:name markdown-preview-mode
        :description "Markdown preview mode with websocket.el"
        :type github
+       :depends (websocket, markdown-mode)
        :website "https://github.com/ancane/markdown-preview-mode.git"
        :pkgname "ancane/markdown-preview-mode")