diff --git a/docs/config/routing.md b/docs/config/routing.md
index c260445..90c9a65 100644
--- a/docs/config/routing.md
+++ b/docs/config/routing.md
@@ -157,7 +157,7 @@
 
 > `attrs`: object
 
-一个 json object，键名字和值皆为字符串，用于检测流量的属性值。当 HTTP headers 包含所有指定的键，并且值包含指定的子字符串，则命中此规则。大小写不敏感。
+一个 json object，键名字和值皆为字符串，用于检测流量的属性值。当 HTTP headers 包含所有指定的键，并且值包含指定的子字符串，则命中此规则。键大小写不敏感。值支持使用正则表达式。
 
 目前只有 http 入站代理会设置这一属性。
 
diff --git a/docs/en/config/routing.md b/docs/en/config/routing.md
index d99d367..1feee40 100644
--- a/docs/en/config/routing.md
+++ b/docs/en/config/routing.md
@@ -164,7 +164,7 @@ The `sniffing` option in the inbound proxy must be enabled to detect the protoco
 
 `attrs`: object
 
-A json object with string keys and values, used to detect the HTTP headers of the traffic. It matches when all specified keys exist in the header and corresponding values are a substring of the header value, case in-sensitive.
+A json object with string keys and values, used to detect the HTTP headers of the traffic. It matches when all specified keys exist in the header and corresponding values are a substring of the header value. The key is case in-sensitive. You can use regex to match with value.
 
 Currently, only the inbound HTTP proxy sets this attribute.