diff --git a/ftplugin/sass.vim b/ftplugin/sass.vim
index 64232a0..e7e5988 100644
--- a/ftplugin/sass.vim
+++ b/ftplugin/sass.vim
@@ -9,8 +9,9 @@ if exists("b:did_ftplugin")
 endif
 let b:did_ftplugin = 1
 
-let b:undo_ftplugin = "setl cms< def< inc< inex< ofu< sua<"
+let b:undo_ftplugin = "setl com< cms< def< inc< inex< ofu< sua<"
 
+setlocal comments=//
 setlocal commentstring=//\ %s
 setlocal define=^\\s*\\%(@mixin\\\|=\\)
 setlocal includeexpr=substitute(v:fname,'\\%(.*/\\\|^\\)\\zs','_','')
diff --git a/ftplugin/scss.vim b/ftplugin/scss.vim
index 981fb1b..bbe90b3 100644
--- a/ftplugin/scss.vim
+++ b/ftplugin/scss.vim
@@ -8,5 +8,6 @@ if exists("b:did_ftplugin")
 endif
 
 runtime! ftplugin/sass.vim
+setlocal comments=s1:/*,mb:*,ex:*/,//
 
 " vim:set sw=2: