diff --git a/OpenRA.Mods.Common/UpdateRules/Rules/20200503/SplitDamagedByTerrain.cs b/OpenRA.Mods.Common/UpdateRules/Rules/20200503/SplitDamagedByTerrain.cs
new file mode 100644
index 0000000000..e4af88d3d6
--- /dev/null
+++ b/OpenRA.Mods.Common/UpdateRules/Rules/20200503/SplitDamagedByTerrain.cs
@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class SplitDamagedByTerrain : UpdateRule
+	{
+		public override string Name { get { return "Several properties of 'DamagedByTerrain' have been moved to the new 'D2kBuilding' trait."; } }
+		public override string Description
+		{
+			get
+			{
+				return "'DamageThreshold' and 'StartOnThreshold' are no longer supported and removed from 'DamagedByTerrain'.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			foreach (var damaged in actorNode.ChildrenMatching("DamagedByTerrain", includeRemovals: false))
+			{
+				if (damaged.RemoveNodes("DamageThreshold") > 0)
+					yield return "'DamageThreshold' was removed from {0} ({1}) without replacement.\n".F(actorNode.Key, actorNode.Location.Filename);
+				if (damaged.RemoveNodes("StartOnThreshold") > 0)
+					yield return "'StartOnThreshold' was removed from {0} ({1}) without replacement.\n".F(actorNode.Key, actorNode.Location.Filename);
+			}
+
+			yield break;
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
index 437b1b4fcb..650e3d95e1 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
@@ -76,6 +76,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new RemoveTurnToDock(),
 				new RenameSmudgeSmokeFields(),
 				new RenameCircleContrast(),
+				new SplitDamagedByTerrain(),
 				new RemoveBuildingInfluence(),
 			})
 		};