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diff --git a/ruby/src/main/java/com/google/protobuf/jruby/RubyEnum.java b/ruby/src/main/java/com/google/protobuf/jruby/RubyEnum.java
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+++ b/ruby/src/main/java/com/google/protobuf/jruby/RubyEnum.java
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+/*
+ * Protocol Buffers - Google's data interchange format
+ * Copyright 2014 Google Inc.  All rights reserved.
+ * https://developers.google.com/protocol-buffers/
+ *
+ * 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.
+ */
+
+package com.google.protobuf.jruby;
+
+import com.google.protobuf.Descriptors;
+import org.jruby.RubyModule;
+import org.jruby.RubyNumeric;
+import org.jruby.anno.JRubyMethod;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+
+public class RubyEnum {
+    /*
+     * call-seq:
+     *     Enum.lookup(number) => name
+     *
+     * This module method, provided on each generated enum module, looks up an enum
+     * value by number and returns its name as a Ruby symbol, or nil if not found.
+     */
+    @JRubyMethod(meta = true)
+    public static IRubyObject lookup(ThreadContext context, IRubyObject recv, IRubyObject number) {
+        RubyEnumDescriptor rubyEnumDescriptorescriptor = (RubyEnumDescriptor) getDescriptor(context, recv);
+        Descriptors.EnumDescriptor descriptor = rubyEnumDescriptorescriptor.getDescriptor();
+        Descriptors.EnumValueDescriptor value = descriptor.findValueByNumber(RubyNumeric.num2int(number));
+        if (value == null) return context.runtime.getNil();
+        return context.runtime.newSymbol(value.getName());
+    }
+
+    /*
+     * call-seq:
+     *     Enum.resolve(name) => number
+     *
+     * This module method, provided on each generated enum module, looks up an enum
+     * value by name (as a Ruby symbol) and returns its name, or nil if not found.
+     */
+    @JRubyMethod(meta = true)
+    public static IRubyObject resolve(ThreadContext context, IRubyObject recv, IRubyObject name) {
+        RubyEnumDescriptor rubyEnumDescriptorescriptor = (RubyEnumDescriptor) getDescriptor(context, recv);
+        Descriptors.EnumDescriptor descriptor = rubyEnumDescriptorescriptor.getDescriptor();
+        Descriptors.EnumValueDescriptor value = descriptor.findValueByName(name.asJavaString());
+        if (value == null) return context.runtime.getNil();
+        return context.runtime.newFixnum(value.getNumber());
+    }
+
+    /*
+     * call-seq:
+     *     Enum.descriptor
+     *
+     * This module method, provided on each generated enum module, returns the
+     * EnumDescriptor corresponding to this enum type.
+     */
+    @JRubyMethod(meta = true, name = "descriptor")
+    public static IRubyObject getDescriptor(ThreadContext context, IRubyObject recv) {
+        return ((RubyModule) recv).getInstanceVariable(Utils.DESCRIPTOR_INSTANCE_VAR);
+    }
+}