diff --git a/httpr.go b/httpr.go
index f2b1352..ad79a10 100644
--- a/httpr.go
+++ b/httpr.go
@@ -212,6 +212,7 @@ func (rr *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 // Handler registers a handler for provided pattern for a given HTTP method.
+// Pattern must start with a slash (/) symbol.
 func (rr *Router) Handler(method, pattern string, handler http.HandlerFunc) error {
 	path, err := newPath(pattern)
 	if err != nil {