diff --git a/lib/loofah/html5/safelist.rb b/lib/loofah/html5/safelist.rb
index 1bde02c..142751f 100644
--- a/lib/loofah/html5/safelist.rb
+++ b/lib/loofah/html5/safelist.rb
@@ -766,6 +766,7 @@ module SafeList
                                        "rsync",
                                        "rtsp",
                                        "sftp",
+                                       "sms",
                                        "ssh",
                                        "tag",
                                        "tel",