diff --git a/src/components/base/collapse-transition.js b/src/components/base/collapse-transition.js
index 4c3c43dc..07eaef75 100644
--- a/src/components/base/collapse-transition.js
+++ b/src/components/base/collapse-transition.js
@@ -1,5 +1,3 @@
-// Thanks to https://github.com/ElemeFE/element/blob/dev/src/transitions/collapse-transition.js
-
 import { addClass, removeClass } from '../../utils/assist';
 
 const Transition = {