diff --git a/desmume/src/addons/piano.cpp b/desmume/src/addons/piano.cpp
index 3d6706704..38d7d53e9 100644
--- a/desmume/src/addons/piano.cpp
+++ b/desmume/src/addons/piano.cpp
@@ -59,8 +59,8 @@ static u8   piano_read08(u32 adr)
 	//0x09FFFFFE:5 = F
 	//0x09FFFFFE:6 = F#
 	//0x09FFFFFE:7 = G
-	//0x09FFFFFE:0 = G#
-	//0x09FFFFFE:1 = A
+	//0x09FFFFFF:0 = G#
+	//0x09FFFFFF:1 = A
 	//0x09FFFFFF:2 = A#
 	//0x09FFFFFF:3 = ?
 	//0x09FFFFFF:4 = ?