Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/SoilProfile/MacroStabilityInwardsStochasticSoilProfile.cs
===================================================================
diff -u -r9f936b0b29f490a024df02345df182133b1c041a -r6545e28fb366f9bfdf71e776a404e9ce256df182
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/SoilProfile/MacroStabilityInwardsStochasticSoilProfile.cs	(.../MacroStabilityInwardsStochasticSoilProfile.cs)	(revision 9f936b0b29f490a024df02345df182133b1c041a)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/SoilProfile/MacroStabilityInwardsStochasticSoilProfile.cs	(.../MacroStabilityInwardsStochasticSoilProfile.cs)	(revision 6545e28fb366f9bfdf71e776a404e9ce256df182)
@@ -100,6 +100,19 @@
             Probability = fromProfile.Probability;
         }
 
+        /// <summary>
+        /// Updates the probability of the <see cref="MacroStabilityInwardsStochasticSoilProfile"/> 
+        /// by adding <paramref name="probabilityToAdd"/>.
+        /// </summary>
+        /// <param name="probabilityToAdd">The amount to increase the <see cref="Probability"/>
+        /// with.</param>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when the <paramref name="probabilityToAdd"/>
+        /// is outside the range [0, 1].</exception>
+        public void AddProbability(double probabilityToAdd)
+        {
+            Probability += probabilityToAdd;
+        }
+
         public override string ToString()
         {
             return SoilProfile?.ToString() ?? string.Empty;