diff --git a/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExt.java b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExt.java
new file mode 100644
index 0000000..d97c950
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+++ b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExt.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.net.flowext;
+
+import org.onosproject.net.flow.FlowRule;
+
+/**
+ * Experimental extension to the flow rule subsystem; still under development.
+ * <p>
+ * FlowRule extended for current FlowRule API.
+ * </p>
+ */
+public interface FlowRuleExt extends FlowRule {
+    /**
+     * Get the flow entry extension.
+     *
+     * @return FlowEntryExtension value.
+     */
+    FlowEntryExtension getFlowEntryExt();
+}