diff --git a/array.go b/array.go
index 8fb02002..ddf3e95b 100644
--- a/array.go
+++ b/array.go
@@ -2372,10 +2372,10 @@ func (a *Array) SlabID() SlabID {
 	return a.root.SlabID()
 }
 
-func (a *Array) ID() ID {
+func (a *Array) ValueID() ValueID {
 	sid := a.SlabID()
 
-	var id ID
+	var id ValueID
 	copy(id[:], sid.address[:])
 	copy(id[8:], sid.index[:])
 
diff --git a/array_test.go b/array_test.go
index 4977a0d4..66b06d08 100644
--- a/array_test.go
+++ b/array_test.go
@@ -2599,7 +2599,7 @@ func TestArrayID(t *testing.T) {
 	require.NoError(t, err)
 
 	sid := array.SlabID()
-	id := array.ID()
+	id := array.ValueID()
 
 	require.Equal(t, sid.address[:], id[:8])
 	require.Equal(t, sid.index[:], id[8:])
diff --git a/map.go b/map.go
index fe8065d6..26d72b59 100644
--- a/map.go
+++ b/map.go
@@ -3861,10 +3861,10 @@ func (m *OrderedMap) SlabID() SlabID {
 	return m.root.SlabID()
 }
 
-func (m *OrderedMap) ID() ID {
+func (m *OrderedMap) ValueID() ValueID {
 	sid := m.SlabID()
 
-	var id ID
+	var id ValueID
 	copy(id[:], sid.address[:])
 	copy(id[8:], sid.index[:])
 
diff --git a/map_test.go b/map_test.go
index 8bcae77d..d31f1172 100644
--- a/map_test.go
+++ b/map_test.go
@@ -4227,7 +4227,7 @@ func TestMapID(t *testing.T) {
 	require.NoError(t, err)
 
 	sid := m.SlabID()
-	id := m.ID()
+	id := m.ValueID()
 
 	require.Equal(t, sid.address[:], id[:8])
 	require.Equal(t, sid.index[:], id[8:])
diff --git a/storage.go b/storage.go
index c0646d5c..d36d0237 100644
--- a/storage.go
+++ b/storage.go
@@ -31,12 +31,16 @@ import (
 
 const LedgerBaseStorageSlabPrefix = "$"
 
-type ID [16]byte
+// ValueID identifies Array and OrderedMap.
+type ValueID [16]byte
 
 type (
 	Address   [8]byte
 	SlabIndex [8]byte
 
+	// SlabID identifies slab in storage.
+	// SlabID should only be used to retrieve,
+	// store, and remove slab in storage.
 	SlabID struct {
 		address Address
 		index   SlabIndex