diff --git a/http/handler.go b/http/handler.go
index f12957d..c39f242 100644
--- a/http/handler.go
+++ b/http/handler.go
@@ -92,7 +92,8 @@ func (this *Handler) ServeHTTP (res http.ResponseWriter, req *http.Request) {
 		}
 	}
 
-	// make req clone with correct ip
+	// make clone of req with correct ip because modifying req directly is
+	// forbidden
 	req = req.Clone(req.Context())
 	req.RemoteAddr = realRemoteAddr
 	log.Println("(i)", req.Method, req.URL, "from", remoteAddrStr)