diff --git a/PDP11/pdp11_defs.h b/PDP11/pdp11_defs.h
index 3c12824f..364b055b 100644
--- a/PDP11/pdp11_defs.h
+++ b/PDP11/pdp11_defs.h
@@ -515,7 +515,7 @@ struct pdp_dib {
 
 typedef struct pdp_dib DIB;
 
-/* Unibus I/O page layout - see pdp11_ui_lib.c for address layout details
+/* Unibus I/O page layout - see pdp11_io_lib.c for address layout details
    Massbus devices (RP, TU) do not appear in the Unibus IO page */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
diff --git a/VAX/vax610_defs.h b/VAX/vax610_defs.h
index 097d2595..034188dd 100644
--- a/VAX/vax610_defs.h
+++ b/VAX/vax610_defs.h
@@ -187,7 +187,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Qbus I/O page layout - see pdp11_ui_lib.c for address layout details */
+/* Qbus I/O page layout - see pdp11_io_lib.c for address layout details */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
 
diff --git a/VAX/vax630_defs.h b/VAX/vax630_defs.h
index ba868037..bfe04eb6 100644
--- a/VAX/vax630_defs.h
+++ b/VAX/vax630_defs.h
@@ -235,7 +235,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Qbus I/O page layout - see pdp11_ui_lib.c for address layout details */
+/* Qbus I/O page layout - see pdp11_io_lib.c for address layout details */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
 
diff --git a/VAX/vax730_defs.h b/VAX/vax730_defs.h
index 56061263..b6c1e376 100644
--- a/VAX/vax730_defs.h
+++ b/VAX/vax730_defs.h
@@ -236,7 +236,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Unibus I/O page layout - see pdp11_ui_lib.c for address layout details */
+/* Unibus I/O page layout - see pdp11_io_lib.c for address layout details */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
 
diff --git a/VAX/vax750_defs.h b/VAX/vax750_defs.h
index bb8955a8..be40685a 100644
--- a/VAX/vax750_defs.h
+++ b/VAX/vax750_defs.h
@@ -269,7 +269,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Unibus I/O page layout - see pdp11_ui_lib.c for address layout details
+/* Unibus I/O page layout - see pdp11_io_lib.c for address layout details
    Massbus devices (RP, TU) do not appear in the Unibus IO page */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
diff --git a/VAX/vax780_defs.h b/VAX/vax780_defs.h
index 2f306e19..23328592 100644
--- a/VAX/vax780_defs.h
+++ b/VAX/vax780_defs.h
@@ -284,7 +284,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Unibus I/O page layout - see pdp11_ui_lib.c for address layout details
+/* Unibus I/O page layout - see pdp11_io_lib.c for address layout details
    Massbus devices (RP, TU) do not appear in the Unibus IO page */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */
diff --git a/VAX/vaxmod_defs.h b/VAX/vaxmod_defs.h
index f6ed72b3..11d7fb5b 100644
--- a/VAX/vaxmod_defs.h
+++ b/VAX/vaxmod_defs.h
@@ -285,7 +285,7 @@ typedef struct {
     int32               (*ack[VEC_DEVMAX])(void);       /* ack routine */
     } DIB;
 
-/* Qbus I/O page layout - see pdp11_ui_lib.c for address layout details */
+/* Qbus I/O page layout - see pdp11_io_lib.c for address layout details */
 
 #define IOBA_AUTO       (0)                             /* Assigned by Auto Configure */