diff --git a/modules/dt.ui.ReplyWidget.less b/modules/dt.ui.ReplyWidget.less
index b675f1705..8bfa49367 100644
--- a/modules/dt.ui.ReplyWidget.less
+++ b/modules/dt.ui.ReplyWidget.less
@@ -68,6 +68,7 @@
 		margin: 1em 0;
 		box-shadow: 0 2px 2px 0 rgba( 0, 0, 0, 0.25 );
 
+		// OOUI Apex theme
 		.skin-monobook & {
 			box-shadow: 0 0.2em 1em rgba( 0, 0, 0, 0.3 );
 		}
@@ -140,6 +141,7 @@
 		}
 
 		.ext-discussiontools-ui-modeTab {
+			// OOUI Apex theme
 			.skin-monobook & {
 				margin-top: 0;
 			}