diff --git a/util/map.go b/util/map.go
index c3d3b44..50d7bfc 100644
--- a/util/map.go
+++ b/util/map.go
@@ -85,7 +85,7 @@ func (m *Map) Len() int {
 	return m.UnsafeLen()
 }
 
-func (m *Map) UnsafeRange(f func(interface{}, interface{})) {
+func (m *Map) UnsafeRange(f func(key interface{},value interface{})) {
 	if m.m == nil {
 		return
 	}
@@ -94,13 +94,13 @@ func (m *Map) UnsafeRange(f func(interface{}, interface{})) {
 	}
 }
 
-func (m *Map) RLockRange(f func(interface{}, interface{})) {
+func (m *Map) RLockRange(f func(key interface{},value interface{})) {
 	m.RLock()
 	defer m.RUnlock()
 	m.UnsafeRange(f)
 }
 
-func (m *Map) LockRange(f func(interface{}, interface{})) {
+func (m *Map) LockRange(f func(key interface{},value interface{})) {
 	m.Lock()
 	defer m.Unlock()
 	m.UnsafeRange(f)