diff --git a/common/openstack/src/main/java/org/jclouds/openstack/services/Extension.java b/common/openstack/src/main/java/org/jclouds/openstack/services/Extension.java
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+++ b/common/openstack/src/main/java/org/jclouds/openstack/services/Extension.java
@@ -0,0 +1,77 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. jclouds licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.jclouds.openstack.services;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import javax.inject.Qualifier;
+
+/**
+ * An extension of a {@link ServiceType service}. In order for us to understand
+ * the context of the extension, we must consider the extensions call.
+ *
+ *
+ * For our purposes, the minimal context of an extension is the type of the
+ * service it extends ex. {@link ServiceType#COMPUTE}, and its namespace ex. http://docs.openstack.org
+ * /ext/keypairs/api/v1.1.
+ *
+ * @author Adrian Cole
+ *
+ * @see ServiceType
+ * @see
+ * @see
+ * @see
+ */
+@Retention(value = RetentionPolicy.RUNTIME)
+@Target(value = { ElementType.TYPE, ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD })
+@Qualifier
+public @interface Extension {
+
+ /**
+ * the service type this is an extension of.
+ *
+ *