diff --git a/ftdetect/mmd.vim b/ftdetect/mmd.vim
index 7a38173..1cb2021 100644
--- a/ftdetect/mmd.vim
+++ b/ftdetect/mmd.vim
@@ -1,3 +1,3 @@
-" markdown filetype file
-au BufRead,BufNewFile *.{mmd}   set filetype=mmd
+" multimarkdown filetype file
+au BufRead,BufNewFile *.{mmd,multimarkdown}   set filetype=mmd