diff --git a/plugin/securemodelines.vim b/plugin/securemodelines.vim
index e23429f..104a649 100644
--- a/plugin/securemodelines.vim
+++ b/plugin/securemodelines.vim
@@ -19,6 +19,7 @@ if (! exists("g:secure_modelines_allowed_items"))
                 \ "shiftwidth",  "sw",
                 \ "expandtab",   "et",   "noexpandtab", "noet",
                 \ "filetype",    "ft",
+                \ "commentstring", "cms",
                 \ "foldmethod",  "fdm",
                 \ "readonly",    "ro",   "noreadonly", "noro",
                 \ "rightleft",   "rl",   "norightleft", "norl",