diff --git a/agent.go b/agent.go
new file mode 100644
index 0000000..cb42de8
--- /dev/null
+++ b/agent.go
@@ -0,0 +1,9 @@
+package ice
+
+type Role byte
+
+// Possible ICE Agent roles.
+const (
+	Controlling Role = iota
+	Controlled
+)
diff --git a/icecontrol.go b/icecontrol.go
index ffa285f..5d4b824 100644
--- a/icecontrol.go
+++ b/icecontrol.go
@@ -29,28 +29,28 @@ func (a *tieBreaker) GetFromAs(m *stun.Message, t stun.AttrType) error {
 	return nil
 }
 
-// Controlled represents ICE-CONTROLLED attribute.
-type Controlled uint64
+// AttrControlled represents ICE-CONTROLLED attribute.
+type AttrControlled uint64
 
 // AddTo adds ICE-CONTROLLED to message.
-func (c Controlled) AddTo(m *stun.Message) error {
+func (c AttrControlled) AddTo(m *stun.Message) error {
 	return tieBreaker(c).AddToAs(m, stun.AttrICEControlled)
 }
 
 // GetFrom decodes ICE-CONTROLLED from message.
-func (c *Controlled) GetFrom(m *stun.Message) error {
+func (c *AttrControlled) GetFrom(m *stun.Message) error {
 	return (*tieBreaker)(c).GetFromAs(m, stun.AttrICEControlled)
 }
 
-// Controlling represents ICE-CONTROLLING attribute.
-type Controlling uint64
+// AttrControlling represents ICE-CONTROLLING attribute.
+type AttrControlling uint64
 
 // AddTo adds ICE-CONTROLLING to message.
-func (c Controlling) AddTo(m *stun.Message) error {
+func (c AttrControlling) AddTo(m *stun.Message) error {
 	return tieBreaker(c).AddToAs(m, stun.AttrICEControlling)
 }
 
 // GetFrom decodes ICE-CONTROLLING from message.
-func (c *Controlling) GetFrom(m *stun.Message) error {
+func (c *AttrControlling) GetFrom(m *stun.Message) error {
 	return (*tieBreaker)(c).GetFromAs(m, stun.AttrICEControlling)
 }
diff --git a/icecontrol_test.go b/icecontrol_test.go
index ef79fce..c6ea46f 100644
--- a/icecontrol_test.go
+++ b/icecontrol_test.go
@@ -8,7 +8,7 @@ import (
 
 func TestControlled_GetFrom(t *testing.T) {
 	m := new(stun.Message)
-	var c Controlled
+	var c AttrControlled
 	if err := c.GetFrom(m); err != stun.ErrAttributeNotFound {
 		t.Error("unexpected error")
 	}
@@ -19,7 +19,7 @@ func TestControlled_GetFrom(t *testing.T) {
 	if _, err := m1.Write(m.Raw); err != nil {
 		t.Error(err)
 	}
-	var c1 Controlled
+	var c1 AttrControlled
 	if err := c1.GetFrom(m1); err != nil {
 		t.Error(err)
 	}
@@ -29,7 +29,7 @@ func TestControlled_GetFrom(t *testing.T) {
 	t.Run("IncorrectSize", func(t *testing.T) {
 		m3 := new(stun.Message)
 		m3.Add(stun.AttrICEControlled, make([]byte, 100))
-		var c2 Controlled
+		var c2 AttrControlled
 		if err := c2.GetFrom(m3); !stun.IsAttrSizeInvalid(err) {
 			t.Error("should error")
 		}
@@ -38,7 +38,7 @@ func TestControlled_GetFrom(t *testing.T) {
 
 func TestControlling_GetFrom(t *testing.T) {
 	m := new(stun.Message)
-	var c Controlling
+	var c AttrControlling
 	if err := c.GetFrom(m); err != stun.ErrAttributeNotFound {
 		t.Error("unexpected error")
 	}
@@ -49,7 +49,7 @@ func TestControlling_GetFrom(t *testing.T) {
 	if _, err := m1.Write(m.Raw); err != nil {
 		t.Error(err)
 	}
-	var c1 Controlling
+	var c1 AttrControlling
 	if err := c1.GetFrom(m1); err != nil {
 		t.Error(err)
 	}
@@ -59,7 +59,7 @@ func TestControlling_GetFrom(t *testing.T) {
 	t.Run("IncorrectSize", func(t *testing.T) {
 		m3 := new(stun.Message)
 		m3.Add(stun.AttrICEControlling, make([]byte, 100))
-		var c2 Controlling
+		var c2 AttrControlling
 		if err := c2.GetFrom(m3); !stun.IsAttrSizeInvalid(err) {
 			t.Error("should error")
 		}