diff --git a/OpenRA.Mods.RA/World/ResourceLayer.cs b/OpenRA.Mods.RA/World/ResourceLayer.cs
index b7bf86fbe5..06dd6ea0c6 100644
--- a/OpenRA.Mods.RA/World/ResourceLayer.cs
+++ b/OpenRA.Mods.RA/World/ResourceLayer.cs
@@ -17,7 +17,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	[Desc("Attach this to the world actor.")]
+	[Desc("Attach this to the world actor.", "Order of the layers defines the Z sorting.")]
 	public class ResourceLayerInfo : TraitInfo<ResourceLayer>, Requires<ResourceTypeInfo> { }
 
 	public class ResourceLayer : IRenderOverlay, IWorldLoaded, ITickRender
@@ -43,7 +43,7 @@ namespace OpenRA.Mods.RA
 				var c = render[cell];
 				if (c.Sprite != null)
 					new SpriteRenderable(c.Sprite, wr.world.Map.CenterOfCell(cell),
-						WVec.Zero, -511, c.Type.Palette, 1f, true).Render(wr);
+						WVec.Zero, -511, c.Type.Palette, 1f, true).Render(wr); // TODO ZOffset is ignored
 			}
 		}
 
diff --git a/OpenRA.Mods.RA/World/SmudgeLayer.cs b/OpenRA.Mods.RA/World/SmudgeLayer.cs
index 6bb76cee7c..e05108f08b 100644
--- a/OpenRA.Mods.RA/World/SmudgeLayer.cs
+++ b/OpenRA.Mods.RA/World/SmudgeLayer.cs
@@ -16,6 +16,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
+	[Desc("Attach this to the world actor.", "Order of the layers defines the Z sorting.")]
 	public class SmudgeLayerInfo : ITraitInfo
 	{
 		public readonly string Type = "Scorch";
@@ -137,7 +138,7 @@ namespace OpenRA.Mods.RA
 					continue;
 
 				new SpriteRenderable(kv.Value.Sprite, world.Map.CenterOfCell(kv.Key),
-					WVec.Zero, -511, pal, 1f, true).Render(wr);
+					WVec.Zero, -511, pal, 1f, true).Render(wr); // TODO ZOffset is ignored
 			}
 		}
 	}