diff --git a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
index 81df62773f..589933bd1e 100644
--- a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
+++ b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
@@ -910,6 +910,7 @@
     <Compile Include="UpdateRules\Rules\20180307\AddShakeToBridge.cs" />
     <Compile Include="UpdateRules\Rules\20180307\IgnoreAbstractActors.cs" />
     <Compile Include="UpdateRules\Rules\20180307\RemoveCanUndeployFromGrantConditionOnDeploy.cs" />
+    <Compile Include="UpdateRules\Rules\DefineNotificationDefaults.cs" />
     <Compile Include="Traits\Player\PlayerResources.cs" />
     <Compile Include="UtilityCommands\DumpSequenceSheetsCommand.cs" />
     <Compile Include="Traits\Render\WithBuildingRepairDecoration.cs" />
diff --git a/OpenRA.Mods.Common/UpdateRules/Rules/DefineNotificationDefaults.cs b/OpenRA.Mods.Common/UpdateRules/Rules/DefineNotificationDefaults.cs
new file mode 100644
index 0000000000..4cd1cbe118
--- /dev/null
+++ b/OpenRA.Mods.Common/UpdateRules/Rules/DefineNotificationDefaults.cs
@@ -0,0 +1,139 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class DefineNotificationDefaults : UpdateRule
+	{
+		public override string Name { get { return "Move mod-specific notifications to yaml"; } }
+		public override string Description
+		{
+			get
+			{
+				return "Mod-specific default notifications values have been removed from several traits and the Radar widget\n" +
+					"(" + traits.Select(f => f.Trait).JoinWith(", ") + ")\n" +
+					"The mod chrome is updated automatically and uses of these traits are listed for inspection so the values can be overriden in yaml.";
+			}
+		}
+
+		class TraitWrapper
+		{
+			public readonly string Trait;
+			public readonly Dictionary<string, string> Fields;
+			public List<string> Uses = new List<string>();
+
+			public TraitWrapper(string trait, Dictionary<string, string> fields)
+			{
+				Trait = trait;
+				Fields = fields;
+			}
+		}
+
+		TraitWrapper[] traits =
+		{
+			new TraitWrapper("PrimaryBuilding", new Dictionary<string, string> {
+				{ "SelectionNotification", "PrimaryBuildingSelected" }
+			}),
+			new TraitWrapper("RepairableBuilding", new Dictionary<string, string> {
+				{ "RepairingNotification", "Repairing" }
+			}),
+			new TraitWrapper("RepairsUnits", new Dictionary<string, string> {
+				{ "StartRepairingNotification", "Repairing" }
+			}),
+			new TraitWrapper("GainsExperience", new Dictionary<string, string> {
+				{ "LevelUpNotification", "LevelUp" }
+			}),
+			new TraitWrapper("MissionObjectives", new Dictionary<string, string> {
+				{ "WinNotification", "Win" },
+				{ "LoseNotification", "Lose" },
+				{ "LeaveNotification", "Leave" }
+			}),
+			new TraitWrapper("PlaceBuilding", new Dictionary<string, string> {
+				{ "NewOptionsNotification", "NewOptions" },
+				{ "CannotPlaceNotification", "BuildingCannotPlaceAudio" }
+			}),
+			new TraitWrapper("PlayerResources", new Dictionary<string, string> {
+				{ "CashTickUpNotification", "CashTickUp" },
+				{ "CashTickDownNotification", "CashTickDown" }
+			}),
+			new TraitWrapper("ProductionQueue", new Dictionary<string, string> {
+				{ "ReadyAudio", "UnitReady" },
+				{ "BlockedAudio", "NoBuild" },
+				{ "QueuedAudio", "Training" },
+				{ "OnHoldAudio", "OnHold" },
+				{ "CancelledAudio", "Cancelled" }
+			}),
+			new TraitWrapper("PowerManager", new Dictionary<string, string> {
+				{ "SpeechNotification", "LowPower" }
+			})
+		};
+
+		string BuildMessage(TraitWrapper t)
+		{
+			return "Default notification values have been removed from {0}.\n".F(t.Trait) +
+				"You may wish to explicitly define the following overrides:\n   " + t.Trait + ":\n" +
+				UpdateUtils.FormatMessageList(t.Fields.Select(kv => "   " + kv.Key + ": " + kv.Value), separator: "  ") +
+				"\non the following actors (if they have not already been inherited from a parent).\n" +
+				UpdateUtils.FormatMessageList(t.Uses);
+		}
+
+		public override IEnumerable<string> AfterUpdate(ModData modData)
+		{
+			foreach (var t in traits)
+			{
+				if (t.Uses.Any())
+					yield return BuildMessage(t);
+
+				t.Uses.Clear();
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			foreach (var t in traits)
+			{
+				foreach (var traitNode in actorNode.ChildrenMatching(t.Trait))
+				{
+					foreach (var f in t.Fields)
+					{
+						var node = traitNode.LastChildMatching(f.Key);
+						if (node == null)
+						{
+							var location = "{0} ({1})".F(actorNode.Key, traitNode.Location.Filename);
+							if (!t.Uses.Contains(location))
+								t.Uses.Add(location);
+						}
+					}
+				}
+			}
+
+			yield break;
+		}
+
+		public override IEnumerable<string> UpdateChromeNode(ModData modData, MiniYamlNode chromeNode)
+		{
+			foreach (var node in chromeNode.ChildrenMatching("Radar"))
+			{
+				if (!node.ChildrenMatching("SoundUp").Any())
+					node.AddNode("SoundUp", "RadarUp");
+
+				if (!node.ChildrenMatching("SoundDown").Any())
+					node.AddNode("SoundDown", "RadarDown");
+			}
+
+			yield break;
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
index 7b849791a2..5e1042b75d 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
@@ -87,7 +87,8 @@ namespace OpenRA.Mods.Common.UpdateRules
 			new UpdatePath("playtest-20180729", new UpdateRule[]
 			{
 				// Bleed only changes here
-				new RenameEditorTilesetFilter()
+				new RenameEditorTilesetFilter(),
+				new DefineNotificationDefaults(),
 			})
 		};
 
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
index 23eda33dc5..6889e95614 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
@@ -221,10 +221,10 @@ namespace OpenRA.Mods.Common.UpdateRules
 							yield return manualStep;
 		}
 
-		public static string FormatMessageList(IEnumerable<string> messages, int indent = 0)
+		public static string FormatMessageList(IEnumerable<string> messages, int indent = 0, string separator = "*")
 		{
 			var prefix = string.Concat(Enumerable.Repeat("   ", indent));
-			return string.Join("\n", messages.Select(m => prefix + " * {0}".F(m.Replace("\n", "\n   " + prefix))));
+			return string.Join("\n", messages.Select(m => prefix + " {0} {1}".F(separator, m.Replace("\n", "\n   " + prefix))));
 		}
 	}