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diff --git a/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionProcessNotifier.java b/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionProcessNotifier.java
index 9bfdaf98f..531618761 100644
--- a/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionProcessNotifier.java
+++ b/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionProcessNotifier.java
@@ -1,14 +1,35 @@
+/*
+ * Copyright (C) 2007-2012 Mathieu Baudier
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.argeo.slc.execution;
 
 import java.util.List;
 
-import org.argeo.slc.process.SlcExecutionStep;
-
+/**
+ * Implementations of this interface can be notified of events related to
+ * process execution.
+ */
 public interface ExecutionProcessNotifier {
-	public void addSteps(ExecutionProcess process,
-			List<SlcExecutionStep> additionalSteps);
-
+	/**
+	 * Notify a status change, see {@link ExecutionProcess} for the list of
+	 * vaailable statuses.
+	 */
 	public void updateStatus(ExecutionProcess process, String oldStatus,
 			String newStatus);
 
+	/** Notifiy of new execution steps. */
+	public void addSteps(ExecutionProcess process, List<ExecutionStep> steps);
+
 }