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diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
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diff --git a/Doc/RomWBW Errata.pdf b/Doc/RomWBW Errata.pdf
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diff --git a/Doc/RomWBW System Guide.pdf b/Doc/RomWBW System Guide.pdf
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diff --git a/Doc/RomWBW User Guide.pdf b/Doc/RomWBW User Guide.pdf
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diff --git a/Source/Doc/UserGuide.md b/Source/Doc/UserGuide.md
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--- a/Source/Doc/UserGuide.md
+++ b/Source/Doc/UserGuide.md
@@ -791,23 +791,34 @@ cases, it was built into the original operating system.  In other cases,
 I have added this capability in the RomWBW BIOS of the operating 
 system.
 
+In all cases, the file containing the commands to run at startup must
+be on the boot drive (A:).  RomWBW automatically assigns A: to the
+disk slice you choose to boot.  Adding a startup command file to the
+ROM Disk is not recommended because it would require customizing and
+building a new ROM.  Use of bootable disk slices is preferred since
+the startup command files can be added/edited without any special
+system customization.
+
 Here is an overview for each operating system:
 
-- **CP/M 2.2** - Will run PROFILE.SUB as a SUBMIT file if it exists in 
-  A: at startup.  Note that CP/M 2.2 itself does not have this ability -- 
-  I added it to the RomWBW CP/M 2.2 BIOS.  So, it will not be documented 
-  in the normal CP/M 2.2 manual.
+- **CP/M 2.2** - Will run PROFILE.SUB as a SUBMIT file if it exists in
+  A: at startup.  Note that original CP/M 2.2 itself did not have this
+  ability -- it was added to the RomWBW CP/M 2.2 BIOS.  The use of SUBMIT
+  files is documented in Section 1.6.7 SUBMIT Command of the CPM Manual 
+  included in the Doc/CPM folder of the RomWBW distribution.
 
-- **Z-System (ZSDOS 1.1)** -  Will run run PROFILE.SUB as a SUBMIT file 
-  if it exists in A: at startup.  Works exactly the same as CP/M 2.2.  Not
-  part of the operating system, but added by me, so it is not documented 
-  in the ZSDOS Manual.
+- **Z-System (ZSDOS 1.1)** - Will run run PROFILE.SUB as a SUBMIT file 
+  if it exists in A: at startup.  Works exactly the same as CP/M 2.2.
+  The original Z-System ZSDOS 1.1 did not have this ability -- it was
+  added to the RomWBW Z-System BIOS.  The Z-System documentation does
+  not cover the use of SUBMIT files -- please refer to the CP/M 2.2
+  documentation.
 
 - **NZCOM** - Will run the command STARTZCM at startup.  This is 
   normally an alias file.  You use SALIAS to edit such files.  Please see 
   Section 3.1 Creating an Alias of the NZCOM Users Manual included in the 
   Doc/CPM folder of the RomWBW distribution.  Note that the NZCOM 
-  distribution inclues a PROFILE.SUB file.  NZCOM itself is launched from 
+  distribution includes a PROFILE.SUB file.  NZCOM itself is launched from 
   ZSDOS.  The included PROFILE.SUB accomplishes this.  Do not modify this 
   file unless you fully understand the NZCOM boot process.