- Assign ClubberTroll to another variable in README

Author: hoangNam

decorator/README.md

@@ -104,9 +104,9 @@ troll.attack(); // The troll tries to grab you!
 troll.fleeBattle(); // The troll shrieks in horror and runs away!
 
 // change the behavior of the simple troll by adding a decorator
-troll = new ClubbedTroll(troll);
-troll.attack(); // The troll tries to grab you! The troll swings at you with a club!
-troll.fleeBattle(); // The troll shrieks in horror and runs away!
+Troll clubbedTroll = new ClubbedTroll(troll);
+clubbedTroll.attack(); // The troll tries to grab you! The troll swings at you with a club!
+clubbedTroll.fleeBattle(); // The troll shrieks in horror and runs away!
 ```
 
 ## Applicability