diff --git a/ui/widgets/progressbar.js b/ui/widgets/progressbar.js
index a52cbb713..07ffaa97f 100644
--- a/ui/widgets/progressbar.js
+++ b/ui/widgets/progressbar.js
@@ -90,7 +90,7 @@ return $.widget( "ui.progressbar", {
 
 		this.indeterminate = newValue === false;
 
-		// sanitize value
+		// Sanitize value
 		if ( typeof newValue !== "number" ) {
 			newValue = 0;
 		}