diff --git a/docs/uts/operator.md b/docs/uts/operator.md
index bceecf0ca422fd0792b6bcef30203c022282c971..d95feebbf9c32fb6dd4e2a3b54d15b8547d1203e 100644
--- a/docs/uts/operator.md
+++ b/docs/uts/operator.md
@@ -391,11 +391,12 @@ a as string ｜ null // 正常
 | number       		  						 			 | "number"         |
 | string       		  						 			 | "string"         |
 | function     		  						 			 | "function"       |
-| 平台专有数字类型: Int, Float, Double, Long ... 			 | "Int","Float","Double","Long" ... |
+| 平台专有数字类型: Int, Float, Double, Long ... 		    | "Int","Float","Double","Long" ... |
+| 平台专有字符串类型: Char ... 			                    | "Char" ... |
 | 其他任何对象(包含但不限于：Date, Array, Map, UTSJSONObject) | "object"         |
 
 > 特别说明：
-> HBuilderX3.9.0统一为以上规范，在HBuilderX3.9.0之前版本平台专有数字类型变量使用typeof操作符获取的值为"number"
+> 平台专有字符串类型: Char 需要HBuilderX 4.0.2 及之后版本支持
 
 为了与web保持一致，typeof除了布尔、数字、字符串、函数外，全部返回object。如需判断object范围内的具体类型，需另见[instanceof](#instanceof)