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diff --git a/websocketpp/extensions/extension.hpp b/websocketpp/extensions/extension.hpp
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+/*
+ * Copyright (c) 2014, Peter Thorson. 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 the WebSocket++ Project 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 PETER THORSON 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 WEBSOCKETPP_EXTENSION_HPP
+#define WEBSOCKETPP_EXTENSION_HPP
+
+#include <websocketpp/common/cpp11.hpp>
+#include <websocketpp/common/system_error.hpp>
+
+#include <string>
+#include <vector>
+
+namespace websocketpp {
+
+/**
+ * Some generic information about extensions
+ *
+ * Each extension object has an implemented flag. It can be retrieved by calling
+ * is_implemented(). This compile time flag indicates whether or not the object
+ * in question actually implements the extension or if it is a placeholder stub
+ *
+ * Each extension object also has an enabled flag. It can be retrieved by
+ * calling is_enabled(). This runtime flag indicates whether or not the
+ * extension has been negotiated for this connection.
+ */
+namespace extensions {
+
+namespace error {
+enum value {
+    /// Catch all
+    general = 1,
+
+    /// Extension disabled
+    disabled
+};
+
+class category : public lib::error_category {
+public:
+    category() {}
+
+    const char *name() const _WEBSOCKETPP_NOEXCEPT_TOKEN_ {
+        return "websocketpp.extension";
+    }
+
+    std::string message(int value) const {
+        switch(value) {
+            case general:
+                return "Generic extension error";
+            case disabled:
+                return "Use of methods from disabled extension";
+            default:
+                return "Unknown permessage-compress error";
+        }
+    }
+};
+
+inline lib::error_category const & get_category() {
+    static category instance;
+    return instance;
+}
+
+inline lib::error_code make_error_code(error::value e) {
+    return lib::error_code(static_cast<int>(e), get_category());
+}
+
+} // namespace error
+} // namespace extensions
+} // namespace websocketpp
+
+_WEBSOCKETPP_ERROR_CODE_ENUM_NS_START_
+template<> struct is_error_code_enum
+    <websocketpp::extensions::error::value>
+{
+    static const bool value = true;
+};
+_WEBSOCKETPP_ERROR_CODE_ENUM_NS_END_
+
+#endif // WEBSOCKETPP_EXTENSION_HPP