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diff --git a/java/com/google/gerrit/extensions/config/ExternalIncludedIn.java b/java/com/google/gerrit/extensions/config/ExternalIncludedIn.java
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+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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 com.google.gerrit.extensions.config;
+
+import com.google.common.collect.ListMultimap;
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+import java.util.Collection;
+
+@ExtensionPoint
+public interface ExternalIncludedIn {
+
+  /**
+   * Returns additional entries for IncludedInInfo as multimap where the key is the row title and
+   * the values are a list of systems that include the given commit (e.g. names of servers on which
+   * this commit is deployed).
+   *
+   * <p>The tags and branches in which the commit is included are provided so that a RevWalk can be
+   * avoided when a system runs a certain tag or branch.
+   *
+   * @param project the name of the project
+   * @param commit the ID of the commit for which it should be checked if it is included
+   * @param tags the tags that include the commit
+   * @param branches the branches that include the commit
+   * @return additional entries for IncludedInInfo
+   */
+  ListMultimap<String, String> getIncludedIn(
+      String project, String commit, Collection<String> tags, Collection<String> branches);
+}