diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NESControllers.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NESControllers.cs
index f0ceeca358..ee37290e51 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NESControllers.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NESControllers.cs
@@ -31,7 +31,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 	public interface IFamicomExpansion
 	{
 		void Strobe(StrobeInfo s, IController c);
-		byte ReadA(IController c); // only uses D1:D4
+		byte ReadA(IController c); // only uses D1
 		byte ReadB(IController c); // only uses D1:D4
 		ControllerDefinition GetDefinition();
 		void SyncState(Serializer ser);