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diff --git a/Source/JavaScriptCore/API/JSVirtualMachine.h b/Source/JavaScriptCore/API/JSVirtualMachine.h
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+++ b/Source/JavaScriptCore/API/JSVirtualMachine.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. ``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
+ * 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. 
+ */
+
+#import <JavaScriptCore/JavaScriptCore.h>
+
+#if JSC_OBJC_API_ENABLED
+
+// An instance of JSVirtualMachine represents a single JavaScript "object space"
+// or set of execution resources. Thread safety is supported by locking the
+// virtual machine, with concurrent JavaScript execution supported by allocating
+// separate instances of JSVirtualMachine.
+
+NS_CLASS_AVAILABLE(10_9, NA)
+@interface JSVirtualMachine : NSObject
+
+// Create a new JSVirtualMachine.
+- (id)init;
+
+// addManagedReference:withOwner and removeManagedReference:withOwner allow 
+// clients of JSVirtualMachine to make the JavaScript runtime aware of 
+// arbitrary external Objective-C object graphs. The runtime can then use 
+// this information to retain any JavaScript values that are referenced 
+// from somewhere in said object graph.
+// 
+// For correct behavior clients must make their external object graphs 
+// reachable from within the JavaScript runtime. If an Objective-C object is 
+// reachable from within the JavaScript runtime, all managed references 
+// transitively reachable from it as recorded with 
+// addManagedReference:withOwner: will be scanned by the garbage collector.
+// 
+- (void)addManagedReference:(id)object withOwner:(id)owner;
+- (void)removeManagedReference:(id)object withOwner:(id)owner;
+
+@end
+
+#endif