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diff --git a/src/node/ext/tag.h b/src/node/ext/tag.h
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+++ b/src/node/ext/tag.h
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+/*
+ *
+ * Copyright 2014, Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ *
+ */
+
+#ifndef NET_GRPC_NODE_TAG_H_
+#define NET_GRPC_NODE_TAG_H_
+
+#include <node.h>
+
+namespace grpc {
+namespace node {
+
+/* Create a void* tag that can be passed to various grpc_call functions from
+   a javascript value and the javascript wrapper for the call. The call can be
+   null. */
+void *CreateTag(v8::Handle<v8::Value> tag, v8::Handle<v8::Value> call);
+/* Return the javascript value stored in the tag */
+v8::Handle<v8::Value> GetTagHandle(void *tag);
+/* Returns true if the call was set (non-null) when the tag was created */
+bool TagHasCall(void *tag);
+/* Returns the javascript wrapper for the call associated with this tag */
+v8::Handle<v8::Value> TagGetCall(void *call);
+/* Destroy the tag and all resources it is holding. It is illegal to call any
+   of these other functions on a tag after it has been destroyed. */
+void DestroyTag(void *tag);
+
+}  // namespace node
+}  // namespace grpc
+
+#endif  // NET_GRPC_NODE_TAG_H_