diff --git a/engine/engine.go b/engine/engine.go
index 698a7d67..b1ed6c43 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -68,7 +68,8 @@ type (
 		// RemoteAddress returns the client's network address.
 		RemoteAddress() string
 
-		// RealIP returns the client's network ip address.
+		// RealIP returns the client's network address based on `X-Forwarded-For`
+		// or `X-Real-IP` request header.
 		RealIP() string
 
 		// Method returns the request's HTTP function.