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diff --git a/Source/JavaScriptCore/runtime/JSInternalPromise.h b/Source/JavaScriptCore/runtime/JSInternalPromise.h
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+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JSInternalPromise_h
+#define JSInternalPromise_h
+
+#include "JSPromise.h"
+
+namespace JSC {
+
+class JSFunction;
+
+// JSInternalPromise is completely separated instance from the JSPromise.
+// Since its prototype and constructor are different from the exposed Promises' ones,
+// all the user modification onto the exposed Promise does not have effect on JSInternalPromise.
+//
+// e.g.
+//     Replacing Promise.prototype.then with the user-customized one does not effect on JSInternalPromise.
+//
+// CAUTION: Must not leak the JSInternalPromise to the user space to keep its integrity.
+class JSInternalPromise : public JSPromise {
+public:
+    typedef JSPromise Base;
+
+    static JSInternalPromise* create(VM&, Structure*);
+    static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
+
+    DECLARE_EXPORT_INFO;
+
+    JS_EXPORT_PRIVATE JSInternalPromise* then(ExecState*, JSFunction* = nullptr, JSFunction* = nullptr);
+
+private:
+    JSInternalPromise(VM&, Structure*);
+};
+
+} // namespace JSC
+
+#endif // JSInternalPromise_h