1 files changed, 37 insertions, 10 deletions
diff --git a/lib/dijit/themes/nihilo/form/Checkbox.css b/lib/dijit/themes/nihilo/form/Checkbox.css
index ceee44ffe..260666f99 100644
--- a/lib/dijit/themes/nihilo/form/Checkbox.css
+++ b/lib/dijit/themes/nihilo/form/Checkbox.css
@@ -1,40 +1,67 @@
 
+/*
+ *  CheckBox and Radio Widgets,
+ *	and the CSS to embed a checkbox or radio icon inside a ToggleButton.
+ *
+ *	Order of images in the default sprite (from L to R, checkbox and radio in same image):
+ *		checkbox	normal 	 - checked
+ *							 - unchecked
+ *					disabled - checked
+ *							 - unchecked
+ *					hover 	 - checked
+ *							 - unchecked
+ *
+ *		radio		normal 	 - checked
+ *							 - unchecked
+ *					disabled - checked
+ *							 - unchecked
+ *					hover 	 - checked
+ *							 - unchecked
+*/
+
 .nihilo .dijitToggleButton .dijitCheckBox,
 .nihilo .dijitToggleButton .dijitCheckBoxIcon {
 	background-image: url('../images/spriteCheckbox.gif');
 }
+
 .nihilo .dijitCheckBox,
-.nihilo .dijitCheckBoxIcon {		
-	background-image: url('../images/spriteCheckbox.gif'); 
+.nihilo .dijitCheckBoxIcon {		/* inside a toggle button */
+	background-image: url('../images/spriteCheckbox.gif'); /* checkbox sprite image */
 	background-repeat: no-repeat;
 	width: 16px;
 	height: 16px;
 	margin: 0;
 	padding: 0;
 }
+
 .nihilo .dijitCheckBox,
 .nihilo .dijitToggleButton .dijitCheckBoxIcon {
-	
+	/* unchecked */
 	background-position: -16px;
 }
+
 .nihilo .dijitCheckBoxChecked,
 .nihilo .dijitToggleButtonChecked .dijitCheckBoxIcon {
-	
-	background-position: 0px;
+	/* checked */
+	background-position: 0;
 }
+
 .nihilo .dijitCheckBoxDisabled {
-	
+	/* disabled */
 	background-position: -48px;
 }
+
 .nihilo .dijitCheckBoxCheckedDisabled {
-	
+	/* disabled but checked */
 	background-position: -32px;
 }
+
 .nihilo .dijitCheckBoxHover {
-	
+	/* hovering over an unchecked enabled checkbox */
 	background-position: -80px;
 }
+
 .nihilo .dijitCheckBoxCheckedHover {
-	
+	/* hovering over a checked enabled checkbox */
 	background-position: -64px;
-}
+}
+\ No newline at end of file