Update README.md

README.md

@@ -291,7 +291,7 @@ let route = HTTPRoute("POST *", body: .json(where: "food == 'fish'"))
 
 ## Route Parameters
 
-Handlers can extract parameter values from the request:
+Handlers can extract any matched `HTTPRouteParameterValue` from  value from the request:
 
 ```swift
 enum Beast: String, HTTPRouteParameterValue {