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diff --git a/lib/public/WorkflowEngine/ISpecificOperation.php b/lib/public/WorkflowEngine/ISpecificOperation.php
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+++ b/lib/public/WorkflowEngine/ISpecificOperation.php
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+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\WorkflowEngine;
+
+/**
+ * Interface ISpecificOperation
+ *
+ * This interface represents an operator that is designed to work with exactly
+ * one entity type.
+ *
+ * In almost all of the cases it is not necessary to have this limitation,
+ * because the action is not connected to the event. This mechanism suits
+ * special cases.
+ *
+ * @package OCP\WorkflowEngine
+ * @since 18.0.0
+ */
+interface ISpecificOperation extends IOperation {
+
+	/**
+	 * returns the id of the entity the operator is designed for
+	 *
+	 * Example: 'WorkflowEngine_Entity_File'
+	 *
+	 * @since 18.0.0
+	 */
+	public function getEntityId():string;
+}