diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
index e12b4671e0..44a69801c3 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
@@ -90,7 +90,7 @@ namespace BizHawk.Client.EmuHawk
 
 		[LuaMethodAttributes(
 			"setmarker",
-			"Adds or sets a marker at the given frame with the given message"
+			"Adds or sets a marker at the given frame, with an optional message"
 		)]
 		public void SetMarker(int frame, string message = null)
 		{