Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/RoughnessProfileSection.cs
===================================================================
diff -u -rd847955b7a8b9bd4cd80c5e10e6a055c9d5daa8b -rd2de88a141d3ba20d1f3b301a3c38723b682b206
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/RoughnessProfileSection.cs	(.../RoughnessProfileSection.cs)	(revision d847955b7a8b9bd4cd80c5e10e6a055c9d5daa8b)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/RoughnessProfileSection.cs	(.../RoughnessProfileSection.cs)	(revision d2de88a141d3ba20d1f3b301a3c38723b682b206)
@@ -24,14 +24,21 @@
 
 namespace Ringtoets.GrassCoverErosionInwards.Data
 {
+    /// <summary>
+    /// This class represents a sub-section of a line and the characteristic properties of that line.
+    /// </summary>
     public class RoughnessProfileSection
     {
         /// <summary>
         /// Creates a new instance of the <see cref="RoughnessProfileSection"/> class.
         /// </summary>
-        /// <param name="startingPoint"></param>
-        /// <param name="endingPoint"></param>
+        /// <param name="startingPoint">Starting point of the section.</param>
+        /// <param name="endingPoint">Ending point of the section.</param>
         /// <param name="roughness">The roughness of the section between <paramref name="startingPoint"/> and <paramref name="endingPoint"/>.</param>
+        /// <exception cref="ArgumentNullException">Thrown when:<list type="bullet">
+        /// <item><paramref name="startingPoint"/> is <c>null</c>.</item>
+        /// <item><paramref name="endingPoint"/> is <c>null</c>.</item>
+        /// </list></exception>
         public RoughnessProfileSection(Point2D startingPoint, Point2D endingPoint, double roughness)
         {
             if (startingPoint == null)