diff --git a/VAX/vax780_defs.h b/VAX/vax780_defs.h
index c36a0b2d..7a26f754 100644
--- a/VAX/vax780_defs.h
+++ b/VAX/vax780_defs.h
@@ -229,7 +229,7 @@
 
 #define DZ_MUXES        4                               /* max # of DZV muxes */
 #define DZ_LINES        8                               /* lines per DZV mux */
-#define VH_MUXES        4                               /* max # of DHQ muxes */
+#define VH_MUXES        4                               /* max # of DHU muxes */
 #define DLX_LINES       16                              /* max # of KL11/DL11's */
 #define DCX_LINES       16                              /* max # of DC11's */
 #define MT_MAXFR        (1 << 16)                       /* magtape max rec */