diff --git a/css/09-booleans.css b/css/09-booleans.css
index 31e0635..6aee6ee 100644
--- a/css/09-booleans.css
+++ b/css/09-booleans.css
@@ -1,3 +1,4 @@
+/* styling elements */
 code,
 kbd,
 mark {
@@ -60,6 +61,7 @@ hr {
   color: #ccc;
   background-color: #ccc;
 }
+/* IE678 support */
 .ie678 h1,
 .ie678 .h1-like {
   font-size: 2.28571429em;
@@ -111,6 +113,7 @@ hr {
 		behavior: url(/lib/box-sizing-polyfill/boxsizing.htc);
 	}
 	*/
+/* styling skip links */
 .skip-links {
   position: absolute;
 }
diff --git a/less/09-booleans.less b/less/09-booleans.less
index 12e39c6..fc3384f 100644
--- a/less/09-booleans.less
+++ b/less/09-booleans.less
@@ -2,6 +2,7 @@
 
 // Styling boolean
 & when (@styling = true) {
+	/* styling elements */
 	code, kbd, mark {
 		border-radius: 2px;
 	}
@@ -66,7 +67,7 @@
 
 // IE6, 7, 8 support boolean
 & when (@ie678 = true) {
-
+	/* IE678 support */
 	.ie678 h1, .ie678 .h1-like {
 		.em(@h1-size);
 	}
@@ -117,6 +118,7 @@
 
 // skip-links boolean
 & when (@skip-links = true) {
+	/* styling skip links */
 	.skip-links {
 		position: absolute;