diff --git a/src/pixi/core/Circle.js b/src/pixi/core/Circle.js
index <HASH>..<HASH> 100644
--- a/src/pixi/core/Circle.js
+++ b/src/pixi/core/Circle.js
@@ -69,5 +69,6 @@ PIXI.Circle.prototype.contains = function(x, y)
     return (dx + dy <= r2);
 }
 
+// constructor
 PIXI.Circle.prototype.constructor = PIXI.Circle;
[DOC] Small changes

* add comment for constructor assignment (as in Point, Rectangle ...)