diff --git a/docs/demo/index.js b/docs/demo/index.js
index 83772a886..468b170cc 100644
--- a/docs/demo/index.js
+++ b/docs/demo/index.js
@@ -14,3 +14,6 @@ dayjs().locale('zh-cn').format()
 // add
 dayjs().add(1, 'year').format()
 
+// subtract
+dayjs().subtract(1, 'year').format()
+