diff --git a/css/font-awesome.css b/css/font-awesome.css
index 048cff973..fc79b7c1d 100644
--- a/css/font-awesome.css
+++ b/css/font-awesome.css
@@ -26,6 +26,7 @@
   line-height: 0.75em;
   vertical-align: -15%;
 }
+/* enlarges the font by 2x, 3x, 4x or 5x */
 .fa-2x {
   font-size: 2em;
 }