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diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/FallThroughCapableMailbox.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/FallThroughCapableMailbox.java
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+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/FallThroughCapableMailbox.java
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+/*******************************************************************************
+ * Copyright (c) 2010-2019, Tamas Szabo, Istvan Rath and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.rete.network.mailbox;
+
+import tools.refinery.viatra.runtime.rete.network.Receiver;
+import tools.refinery.viatra.runtime.rete.network.communication.CommunicationTracker;
+
+/**
+ * A fall through capable mailbox can directly call the update method of its {@link Receiver} instead of using the
+ * standard post-deliver mailbox semantics. If the fall through flag is set to true, the mailbox uses direct delivery,
+ * otherwise it operates in the original behavior. The fall through operation is preferable whenever applicable because
+ * it improves performance. The fall through flag is controlled by the {@link CommunicationTracker} based on the
+ * receiver node type and network topology.
+ * 
+ * @author Tamas Szabo
+ * @since 2.2
+ */
+public interface FallThroughCapableMailbox extends Mailbox {
+
+    public boolean isFallThrough();
+
+    public void setFallThrough(final boolean fallThrough);
+
+}