Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Update/GrassCoverErosionInwardsFailureMechanismUpdateExtensions.cs
===================================================================
diff -u -rae6f0c6b534ca650e160ae6d9c0bc90369d25c68 -rd86b1c6e4ebde1570bec162a9043bbb437de5d9c
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Update/GrassCoverErosionInwardsFailureMechanismUpdateExtensions.cs	(.../GrassCoverErosionInwardsFailureMechanismUpdateExtensions.cs)	(revision ae6f0c6b534ca650e160ae6d9c0bc90369d25c68)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Update/GrassCoverErosionInwardsFailureMechanismUpdateExtensions.cs	(.../GrassCoverErosionInwardsFailureMechanismUpdateExtensions.cs)	(revision d86b1c6e4ebde1570bec162a9043bbb437de5d9c)
@@ -22,6 +22,8 @@
 using System;
 using Application.Ringtoets.Storage.Create;
 using Application.Ringtoets.Storage.DbContext;
+using Application.Ringtoets.Storage.Exceptions;
+
 using Ringtoets.GrassCoverErosionInwards.Data;
 
 namespace Application.Ringtoets.Storage.Update
@@ -43,6 +45,8 @@
         /// <item><paramref name="registry"/> is <c>null</c></item>
         /// <item><paramref name="context"/> is <c>null</c></item>
         /// </list></exception>
+        /// <exception cref="EntityNotFoundException">When <paramref name="mechanism"/>
+        /// does not have a corresponding entity in <paramref name="context"/>.</exception>
         internal static void Update(this GrassCoverErosionInwardsFailureMechanism mechanism, PersistenceRegistry registry, IRingtoetsEntities context)
         {
             if (context == null)