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diff --git a/predicate-search-core/src/main/java/com/yahoo/search/predicate/optimization/PredicateProcessor.java b/predicate-search-core/src/main/java/com/yahoo/search/predicate/optimization/PredicateProcessor.java
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+++ b/predicate-search-core/src/main/java/com/yahoo/search/predicate/optimization/PredicateProcessor.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.search.predicate.optimization;
+
+import com.yahoo.document.predicate.Predicate;
+
+/**
+ * A predicate processor takes a predicate, processes it and returns the result.
+ * Predicate optimisers typically implement this interface.
+ * Note that the interface does not give any guarantees if the processor will
+ * modify the predicate in-place or return a new instance.
+ *
+ * @author bjorncs
+ */
+@FunctionalInterface
+public interface PredicateProcessor {
+
+    /**
+     * Processes a predicate.
+     *
+     * @return the processed predicate.
+     */
+    Predicate process(Predicate predicate, PredicateOptions options);
+
+}