diff --git a/wp-admin/wp-admin.css b/wp-admin/wp-admin.css
index 32be65eed7..689b3af8d9 100644
--- a/wp-admin/wp-admin.css
+++ b/wp-admin/wp-admin.css
@@ -139,6 +139,10 @@ textarea, input, select {
 	font-family: "Courier New", Courier, mono;
 }
 
+.commentlist li {
+	border-bottom: 1px solid #369;
+}
+
 .ed_button {
 	padding: 1px;
 }