Clarify .clone() action

docs/api/core/Geometry.html

@@ -278,6 +278,8 @@
 		<div>
 		Creates a new clone of the Geometry.
 		</div>
+		
+		<div>This method copies only vertices, faces and uvs. It does not copy any other properties of the geometry.</div>
 
 		<h3>[method:null dispose]()</h3>
 		<div>