Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 24282)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -1102,7 +1102,8 @@
  * ----------------------------------------------------------------------------
  */
 
-.entry-content {
+.entry-content,
+.comment-author .fn {
 	-webkit-hyphens: auto;
 	-moz-hyphens:    auto;
 	-ms-hyphens:     auto;