diff --git a/docs/add-ons/configuration.md b/docs/add-ons/configuration.md
index 906f09e9..bf10372e 100644
--- a/docs/add-ons/configuration.md
+++ b/docs/add-ons/configuration.md
@@ -229,7 +229,7 @@ logins:
 random:
   - "match(^\\w*$)"
 link: url
-size: "int(5, 20)"
+size: "int(5,20)"
 count: float
 not_need: "str?"
 ```