diff --git a/packages/icon/README.md b/packages/icon/README.md
index 4e5d3bbb..4c4a55b6 100644
--- a/packages/icon/README.md
+++ b/packages/icon/README.md
@@ -26,7 +26,7 @@
 | name | 图标名称 | `String` | - |
 | info | 图标右上角文字提示 | `String | Number` | - |
 | color | 图标颜色 | `String` | `inherit` |
-| size | 图标大小 | `String` | `inherit` |
+| size | 图标大小，如 `20px`，`2em` | `String` | `inherit` |
 | class-prefix | 类名前缀 | `String` | `van-icon` |
 
 ### Event