diff --git a/libsrc/atari/fdtable.s b/libsrc/atari/fdtable.s
index 5a8063c38..991139f2f 100644
--- a/libsrc/atari/fdtable.s
+++ b/libsrc/atari/fdtable.s
@@ -88,7 +88,7 @@ loop:	sta	ICHID,x
 
 
 ; gets fd in ax
-; return iocb index in X
+; return iocb index in A
 ; return N bit set for invalid fd
 ; all registers destroyed
 .proc	fdtoiocb