diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper191.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper191.cs
index 694462a5b7..2d8d0f5ea8 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper191.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper191.cs
@@ -20,6 +20,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			Cart.vram_size = 2;
 			BaseSetup();
 
+			//theres a possibly bogus Q Boy rom using this mapper but I have no idea what emulator its supposed to boot in, for proof
 			throw new InvalidOperationException("THIS MAPPER ISNT TESTED! WHAT GAME USES IT? PLEASE REPORT!");
 
 			//return true;