Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/IAssessmentSectionMergeHandler.cs
===================================================================
diff -u -re9dd89fe8ee46c8306ba51ae561446f25307cc45 -r1604f9968c87181d6e94d89b287fc8dd5a85854b
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/IAssessmentSectionMergeHandler.cs	(.../IAssessmentSectionMergeHandler.cs)	(revision e9dd89fe8ee46c8306ba51ae561446f25307cc45)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/IAssessmentSectionMergeHandler.cs	(.../IAssessmentSectionMergeHandler.cs)	(revision 1604f9968c87181d6e94d89b287fc8dd5a85854b)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Collections.Generic;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Integration.Data;
@@ -36,6 +37,7 @@
         /// <param name="targetAssessmentSection">The assessment section to merge to.</param>
         /// <param name="sourceAssessmentSection">The assessment section to merge from.</param>
         /// <param name="failureMechanismsToMerge">The failure mechanisms to merge.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         void PerformMerge(AssessmentSection targetAssessmentSection, AssessmentSection sourceAssessmentSection,
                           IEnumerable<IFailureMechanism> failureMechanismsToMerge);
     }