diff --git a/Sources/SKNodeBuilder/Builder.swift b/Sources/SKNodeBuilder/Builder.swift
index 4c4ebdf..cc59559 100644
--- a/Sources/SKNodeBuilder/Builder.swift
+++ b/Sources/SKNodeBuilder/Builder.swift
@@ -51,6 +51,10 @@ final public class UnownedNodeBuilder<Body: SKNode>: NSObject, BuilderProtocol {
     
 }
 
+/// 後方互換性のサポート.
+///- attention: v3.1.3 以降は非推奨となります.
+public typealias ChildNodeBuilder = UnownedNodeBuilder
+
 public extension BuilderProtocol {
     
     @discardableResult func add<Node: SKNode>(child builer: Builder<Node>) -> Self {