Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Converters/ReferenceLineConverter.cs
===================================================================
diff -u -r4670af35a2cb3c8b78d68a25804c3b620da19ddb -r3296448aeb47b8958143a00e05db76cd55627e97
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Converters/ReferenceLineConverter.cs	(.../ReferenceLineConverter.cs)	(revision 4670af35a2cb3c8b78d68a25804c3b620da19ddb)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Converters/ReferenceLineConverter.cs	(.../ReferenceLineConverter.cs)	(revision 3296448aeb47b8958143a00e05db76cd55627e97)
@@ -7,10 +7,25 @@
 
 namespace Application.Ringtoets.Storage.Converters
 {
+    /// <summary>
+    /// This class is able to convert a <see cref="ReferenceLine"/> model to a <see cref="ReferenceLinePointEntity"/>
+    /// entity and back.
+    /// </summary>
     public class ReferenceLineConverter : IEntityConverter<ReferenceLine, ICollection<ReferenceLinePointEntity>>
     {
+        /// <summary>
+        /// Creates a new <see cref="ReferenceLine"/> from the <paramref name="entityCollection"/>.
+        /// </summary>
+        /// <param name="entityCollection">Collection of <see cref="ReferenceLinePointEntity"/> containing
+        /// the geometry of the <see cref="ReferenceLine"/>.</param>
+        /// <returns>A new <see cref="ReferenceLine"/> instance with its geometry taken from the 
+        /// <paramref name="entityCollection"/>.</returns>
         public ReferenceLine ConvertEntityToModel(ICollection<ReferenceLinePointEntity> entityCollection)
         {
+            if (entityCollection == null)
+            {
+                throw new ArgumentNullException("entityCollection");
+            }
             var line = new ReferenceLine();
 
             var geometry = entityCollection.Select(entity => new Point2D(decimal.ToDouble(entity.X), decimal.ToDouble(entity.Y)));
@@ -19,21 +34,30 @@
             return line;
         }
 
-        public ReferenceLine ConvertEntityToModel(ICollection<ReferenceLinePointEntity> entity, Func<ReferenceLine> model)
+        /// <summary>
+        /// Updates the <paramref name="entityCollection"/> by adding the geometry from <see cref="ReferenceLine"/> to it.
+        /// </summary>
+        /// <param name="modelObject">The <see cref="ReferenceLine"/> used as source.</param>
+        /// <param name="entityCollection">The target collection.</param>
+        public void ConvertModelToEntity(ReferenceLine modelObject, ICollection<ReferenceLinePointEntity> entityCollection)
         {
-            throw new NotImplementedException();
-        }
+            if (modelObject == null)
+            {
+                throw new ArgumentNullException("modelObject");
+            }
+            if (entityCollection == null)
+            {
+                throw new ArgumentNullException("entityCollection");
+            }
 
-        public void ConvertModelToEntity(ReferenceLine modelObject, ICollection<ReferenceLinePointEntity> entity)
-        {
-            entity.Clear();
+            entityCollection.Clear();
             foreach (Point2D point in modelObject.Points)
             {
-                entity.Add(new ReferenceLinePointEntity
+                entityCollection.Add(new ReferenceLinePointEntity
                 {
                     X = Convert.ToDecimal(point.X),
                     Y = Convert.ToDecimal(point.Y),
-                    Order = entity.Count
+                    Order = entityCollection.Count
                 });
             }
         }