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diff --git a/Source/JavaScriptCore/API/JSManagedValue.h b/Source/JavaScriptCore/API/JSManagedValue.h
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+++ b/Source/JavaScriptCore/API/JSManagedValue.h
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+/*
+ * Copyright (C) 2013 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 JSManagedValue_h
+#define JSManagedValue_h
+
+#import <JavaScriptCore/JSBase.h>
+#import <JavaScriptCore/WebKitAvailability.h>
+
+#if JSC_OBJC_API_ENABLED
+
+@class JSValue;
+@class JSContext;
+
+/*!
+@interface
+@discussion JSManagedValue represents a "conditionally retained" JSValue. 
+ "Conditionally retained" means that as long as the JSManagedValue's 
+ JSValue is reachable through the JavaScript object graph,
+ or through the Objective-C object graph reported to the JSVirtualMachine using
+ addManagedReference:withOwner:, the corresponding JSValue will 
+ be retained. However, if neither graph reaches the JSManagedValue, the 
+ corresponding JSValue will be released and set to nil.
+
+The primary use for a JSManagedValue is to store a JSValue in an Objective-C
+or Swift object that is exported to JavaScript. It is incorrect to store a JSValue
+in an object that is exported to JavaScript, since doing so creates a retain cycle.
+*/ 
+NS_CLASS_AVAILABLE(10_9, 7_0)
+@interface JSManagedValue : NSObject
+
+/*!
+@method
+@abstract Create a JSManagedValue from a JSValue.
+@result The new JSManagedValue.
+*/
++ (JSManagedValue *)managedValueWithValue:(JSValue *)value;
++ (JSManagedValue *)managedValueWithValue:(JSValue *)value andOwner:(id)owner NS_AVAILABLE(10_10, 8_0);
+
+/*!
+@method
+@abstract Create a JSManagedValue.
+@result The new JSManagedValue.
+*/
+- (instancetype)initWithValue:(JSValue *)value;
+
+/*!
+@property
+@abstract Get the JSValue from the JSManagedValue.
+@result The corresponding JSValue for this JSManagedValue or 
+ nil if the JSValue has been collected.
+*/
+@property (readonly, strong) JSValue *value;
+
+@end
+
+#endif // JSC_OBJC_API_ENABLED
+
+#endif // JSManagedValue_h