diff --git a/OpenRA.Mods.Common/UpdateRules/UpdateRule.cs b/OpenRA.Mods.Common/UpdateRules/UpdateRule.cs
index 9b77bda5fe..d84a9017ff 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdateRule.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdateRule.cs
@@ -24,8 +24,13 @@ namespace OpenRA.Mods.Common.UpdateRules
 		/// <returns>An enumerable of manual steps to be run by the user</returns>
 		public delegate IEnumerable<string> TopLevelNodeTransform(ModData modData, MiniYamlNode node);
 
+		/// <summary>Defines a transformation that is run on each widget node in a chrome yaml file set.</summary>
+		/// <returns>An enumerable of manual steps to be run by the user</returns>
+		public delegate IEnumerable<string> ChromeNodeTransform(ModData modData, MiniYamlNode widgetNode);
+
 		public virtual IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode) { yield break; }
 		public virtual IEnumerable<string> UpdateWeaponNode(ModData modData, MiniYamlNode weaponNode) { yield break; }
+		public virtual IEnumerable<string> UpdateChromeNode(ModData modData, MiniYamlNode chromeNode) { yield break; }
 		public virtual IEnumerable<string> UpdateTilesetNode(ModData modData, MiniYamlNode tilesetNode) { yield break; }
 
 		public virtual IEnumerable<string> BeforeUpdate(ModData modData) { yield break; }
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
index 3bdfa160d2..74ebf7c1f1 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
@@ -109,6 +109,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 			manualSteps.AddRange(ApplyTopLevelTransform(modData, modRules, rule.UpdateActorNode));
 			manualSteps.AddRange(ApplyTopLevelTransform(modData, modWeapons, rule.UpdateWeaponNode));
 			manualSteps.AddRange(ApplyTopLevelTransform(modData, modTilesets, rule.UpdateTilesetNode));
+			manualSteps.AddRange(ApplyChromeTransform(modData, modChromeLayout, rule.UpdateChromeNode));
 			manualSteps.AddRange(rule.AfterUpdate(modData));
 
 			files = modRules.ToList();
@@ -119,6 +120,29 @@ namespace OpenRA.Mods.Common.UpdateRules
 			return manualSteps;
 		}
 
+		static IEnumerable<string> ApplyChromeTransformInner(ModData modData, MiniYamlNode current, UpdateRule.ChromeNodeTransform transform)
+		{
+			foreach (var manualStep in transform(modData, current))
+				yield return manualStep;
+
+			var childrenNode = current.Value.Nodes.FirstOrDefault(n => n.Key == "Children");
+			if (childrenNode != null)
+				foreach (var node in childrenNode.Value.Nodes)
+					foreach (var manualStep in ApplyChromeTransformInner(modData, node, transform))
+						yield return manualStep;
+		}
+
+		static IEnumerable<string> ApplyChromeTransform(ModData modData, YamlFileSet files, UpdateRule.ChromeNodeTransform transform)
+		{
+			if (transform == null)
+				yield break;
+
+			foreach (var file in files)
+				foreach (var node in file.Item3)
+					foreach (var manualStep in ApplyChromeTransformInner(modData, node, transform))
+						yield return manualStep;
+		}
+
 		static IEnumerable<string> ApplyTopLevelTransform(ModData modData, YamlFileSet files, UpdateRule.TopLevelNodeTransform transform)
 		{
 			if (transform == null)