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diff --git a/lib/public/WorkflowEngine/IComplexOperation.php b/lib/public/WorkflowEngine/IComplexOperation.php
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+++ b/lib/public/WorkflowEngine/IComplexOperation.php
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+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\WorkflowEngine;
+
+/**
+ * Interface IComplexOperation
+ *
+ * This interface represents an operator that is less generic and indicates
+ * that some of the tasks it does itself instead of relying on the engine.
+ * This includes:
+ *
+ * * registering listeners – the implementing app needs to ensure that the
+ *   business logic registers listeners to the events it listens to. For example
+ *   when direct storage access is required, adding a wrapper or listening to
+ *   a specific one is required over usual file events.
+ *
+ *
+ * @since 18.0.0
+ */
+interface IComplexOperation extends IOperation {
+	/**
+	 * As IComplexOperation chooses the triggering events itself, a hint has
+	 * to be shown to the user so make clear when this operation is becoming
+	 * active. This method returns such a translated string.
+	 *
+	 * Example: "When a file is accessed" (en)
+	 *
+	 * @since 18.0.0
+	 */
+	public function getTriggerHint(): string;
+}