Index: Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/ISellmeijerCalculator.cs
===================================================================
diff -u -r0dfaf04c32ddd8f2ccfe1e244bdc6efcbb3b6857 -rb7563238aa805cb6207e948a97f6fcc9e52c92b2
--- Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/ISellmeijerCalculator.cs	(.../ISellmeijerCalculator.cs)	(revision 0dfaf04c32ddd8f2ccfe1e244bdc6efcbb3b6857)
+++ Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/ISellmeijerCalculator.cs	(.../ISellmeijerCalculator.cs)	(revision b7563238aa805cb6207e948a97f6fcc9e52c92b2)
@@ -109,7 +109,7 @@
         double WhitesDragCoefficient { set; }
 
         /// <summary>
-        /// Sets the BottomLevelAquitardAboveExitPointZ property to use in the Sellmeijer calculation.
+        /// Sets the bottom level of the bottom most aquitard that is above the exit point's z-coordinate.
         /// </summary>
         double BottomLevelAquitardAboveExitPointZ { set; }
 
@@ -146,7 +146,7 @@
         /// <summary>
         /// Performs the Sellmeijer validation.
         /// </summary>
-        /// <returns>A list of validation strings.</returns>
+        /// <returns>A list of validation strings, or an empty list if there are no validation errors.</returns>
         List<string> Validate();
     }
 }
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