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diff --git a/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java b/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.prelude.query;
+
+/**
+ * A composite item which specifies semantics which are not maintained
+ * if an instance with a single child is replaced by the single child.
+ * <p>
+ * Most composites, like AND and OR, are reducible as e.g (AND a) is semantically equal to (a).
+ * <p>
+ * This type functions as a marked interfaces for query rewriters.
+ *
+ * @author <a href="mailto:bratseth@yahoo-inc.com">Jon Bratseth</a>
+ * @since 5.1.22
+ */
+public abstract class NonReducibleCompositeItem extends CompositeItem {
+}