Index: Ringtoets/Common/src/Ringtoets.Common.IO/SurfaceLines/ISurfaceLineTransformer.cs
===================================================================
diff -u -rb8fa5d6867c945f3f1744fd1455b89cadb357959 -r683ff9234262d9fa3bea5edc0abe35254f80e49d
--- Ringtoets/Common/src/Ringtoets.Common.IO/SurfaceLines/ISurfaceLineTransformer.cs	(.../ISurfaceLineTransformer.cs)	(revision b8fa5d6867c945f3f1744fd1455b89cadb357959)
+++ Ringtoets/Common/src/Ringtoets.Common.IO/SurfaceLines/ISurfaceLineTransformer.cs	(.../ISurfaceLineTransformer.cs)	(revision 683ff9234262d9fa3bea5edc0abe35254f80e49d)
@@ -35,8 +35,9 @@
         /// </summary>
         /// <param name="surfaceLine">The surface line to use in the tranformation.</param>
         /// <param name="characteristicPoints">The characteristic points to use in the transformation.</param>
-        /// <returns>A new <typeparamref name="T"/> based on the given data or <c>null</c> if the transformation
-        /// failed.</returns>
+        /// <returns>A new <typeparamref name="T"/> based on the given data.</returns>
+        /// <exception cref="SurfaceLineTransformException">Thrown when transformation would not result
+        /// in a valid transformed instance.</exception>
         T Transform(SurfaceLine surfaceLine, CharacteristicPoints characteristicPoints);
     }
 }
\ No newline at end of file