diff --git a/uc-ctrl-tab.css b/uc-ctrl-tab.css
index 187954f..6c42b55 100644
--- a/uc-ctrl-tab.css
+++ b/uc-ctrl-tab.css
@@ -4,7 +4,7 @@
  * file, You can obtain one at http://creativecommons.org/licenses/by-nc-sa/4.0/
  * or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. */
 
-/* this stylesheet only controls the appearance of the ctrl+tab popup */
+/* this stylesheet only controls the appearance of the ctrl+tab popup. */
 
 #ctrlTab-previews {
   align-items: center;