diff --git a/less/_07-flexbox.less b/less/_07-flexbox.less
index 80f65f5..e577f03 100644
--- a/less/_07-flexbox.less
+++ b/less/_07-flexbox.less
@@ -1,11 +1,12 @@
 
-/* flexbox layout */
+/* flexbox layout
+   Tutorial: http://knacss.com/demos/tutoriel.html#flex */
 .flex {
-	display : -webkit-box;
-	display : -moz-box;
+	display: -webkit-box;
+	display: -moz-box;
 	display: -ms-flexbox;
-	display : -webkit-flex;
-	display : flex;
+	display: -webkit-flex;
+	display: flex;
 }
 .flex-h {
 	-webkit-box-orient: horizontal;
@@ -31,24 +32,24 @@
 .flex-start {
 	-webkit-box-ordinal-group: -1;
 	-moz-box-ordinal-group: 0;
-	-ms-flex-order : -1;
-	-webkit-order : -1;
-	-moz-order : -1;
-	order : -1;
+	-ms-flex-order: -1;
+	-webkit-order: -1;
+	-moz-order: -1;
+	order: -1;
 }
 .flex-mid {
 	-webkit-box-ordinal-group: 1;
 	-moz-box-ordinal-group: 1;
-	-ms-flex-order : 1;
-	-webkit-order : 1;
-	-moz-order : 1;
-	order : 1;
+	-ms-flex-order: 1;
+	-webkit-order: 1;
+	-moz-order: 1;
+	order: 1;
 }
 .flex-end {
 	-webkit-box-ordinal-group: 42;
 	-moz-box-ordinal-group: 42;
-	-ms-flex-order : 42;
-	-webkit-order : 42;
-	-moz-order : 42;
-	order : 42;
+	-ms-flex-order: 42;
+	-webkit-order: 42;
+	-moz-order: 42;
+	order: 42;
 }
\ No newline at end of file