diff --git a/include/cdio/scsi_mmc.h b/include/cdio/scsi_mmc.h
index c6467af6..a7600555 100644
--- a/include/cdio/scsi_mmc.h
+++ b/include/cdio/scsi_mmc.h
@@ -1,5 +1,5 @@
 /*
-    $Id: scsi_mmc.h,v 1.2 2004/05/11 02:15:47 rocky Exp $
+    $Id: scsi_mmc.h,v 1.3 2004/05/26 06:29:15 rocky Exp $
 
     Copyright (C) 2003, 2004 Rocky Bernstein <rocky@panix.com>
 
@@ -48,6 +48,13 @@
 #define CDIO_MMC_GPCMD_READ_CD	        0xbe
 #define CDIO_MMC_GPCMD_READ_MSF	        0xb9
 
+/*! This is listed as optional in ATAPI 2.6, but is (curiously) 
+  missing from Mt. Fuji, Table 57.  It _is_ mentioned in Mt. Fuji
+  Table 377 as an MMC command for SCSi devices though...  Most ATAPI
+  drives support it. */
+#define CDIO_MMC_GPCMD_SET_SPEED	0xbb
+
+
 #define CDIO_MMC_SET_COMMAND(rec, command) \
   rec[0] = command
 
diff --git a/include/cdio/types.h b/include/cdio/types.h
index 52f77d74..8541ce4f 100644
--- a/include/cdio/types.h
+++ b/include/cdio/types.h
@@ -1,5 +1,5 @@
 /*
-    $Id: types.h,v 1.16 2004/05/11 02:15:57 rocky Exp $
+    $Id: types.h,v 1.17 2004/05/26 06:29:15 rocky Exp $
 
     Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
     Copyright (C) 2002, 2003, 2004 Rocky Bernstein <rocky@panix.com>
@@ -238,6 +238,11 @@ extern "C" {
   */
 #define CDIO_INVALID_LSN    CDIO_INVALID_LBA
 
+  /*! 
+    Number of ASCII bytes in a media catalog number (MCN).
+  */
+#define CDIO_MCN_SIZE       13
+
 typedef int cdio_fs_anal_t;
 
 /*! The type of an drive capability bit mask. See below for values*/