diff --git a/OpenRA.Mods.Common/Traits/CustomBuildTimeValue.cs b/OpenRA.Mods.Common/Traits/CustomBuildTimeValue.cs
index 2ef19fd6c7..ba06e5d9ad 100644
--- a/OpenRA.Mods.Common/Traits/CustomBuildTimeValue.cs
+++ b/OpenRA.Mods.Common/Traits/CustomBuildTimeValue.cs
@@ -15,6 +15,7 @@ namespace OpenRA.Mods.Common
 	[Desc("Overrides the build time calculated by actor value.")]
 	public class CustomBuildTimeValueInfo : TraitInfo<CustomBuildTimeValue>
 	{
+		[Desc("Measured in ticks.")]
 		public readonly int Value = 0;
 	}