Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 21445)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -1925,6 +1925,7 @@
 	margin: 0 0 1.625em;
 	padding: 1.625em;
 	position: relative;
+	word-wrap: break-word;
 }
 .commentlist .pingback {
 	margin: 0 0 1.625em;