Fix comment.

lib/mixins/element-mixin.html

@@ -656,10 +656,6 @@
           hostStack.endHosting(this);
           this.$ = this.root.$;
         }
-        // The super.ready here makes this element able to observe data changes.
-        // We must wait to do this until after client dom is created/attached
-        // so that any notifications fired during this process are not handled
-        // before all clients are ready.
         super.ready();
       }
 
@@ -676,6 +672,10 @@
         if (this._template) {
           this.root = this._attachDom(this.root);
         }
+        // The super._readyClients here sets the clients initialized flag.
+        // We must wait to do this until after client dom is created/attached
+        // so that this flag can be checked to prevent notifications fired
+        // during this process from being handled before clients are ready.
         super._readyClients();
       }