diff --git a/disks/pc/dos/ibm/1.00/README.md b/disks/pc/dos/ibm/1.00/README.md
index 3c6a205bb..c6c5cb416 100644
--- a/disks/pc/dos/ibm/1.00/README.md
+++ b/disks/pc/dos/ibm/1.00/README.md
@@ -71,7 +71,8 @@ CHKDSK reports:
 	      160256 bytes total disk space
 	        6144 bytes remain available
 
-Additional details from [PC DOS Retro](https://sites.google.com/site/pcdosretro/doshist):
+Additional Information From [PC DOS Retro](https://sites.google.com/site/pcdosretro/doshist)
+---
 
 - distributed on 1 160KB floppy disk
 - initial release (equivalent to 86-DOS 1.14)
@@ -101,4 +102,4 @@ Additional details from [PC DOS Retro](https://sites.google.com/site/pcdosretro/
 - CP/M CALL 0 interface (executes INT 20h)
 - CP/M CALL 5 interface supporting INT 21h functions 00h-24h
 
-See [PC-DOS 1.00 Documentation](../../../../../pubs/pc/software/dos/PCDOS100/) for more information.
+See [PC-DOS 1.00 Documentation](/pubs/pc/software/dos/PCDOS100/) for more information.
diff --git a/disks/pc/dos/ibm/1.10/README.md b/disks/pc/dos/ibm/1.10/README.md
index 63f50682d..82aecb2cc 100644
--- a/disks/pc/dos/ibm/1.10/README.md
+++ b/disks/pc/dos/ibm/1.10/README.md
@@ -65,7 +65,8 @@ CHKDSK reports:
 	      144384 bytes in 26 user files 
 	        7168 bytes available on disk
 
-Additional details from [PC DOS Retro](https://sites.google.com/site/pcdosretro/doshist):
+Additional Information From [PC DOS Retro](https://sites.google.com/site/pcdosretro/doshist)
+---
 
 - distributed on 1 160KB floppy disk
 - double-sided 320KB floppy disk support added
@@ -75,4 +76,4 @@ Additional details from [PC DOS Retro](https://sites.google.com/site/pcdosretro/
 - new external command: EXE2BIN
 - INT 21h functions 1Ch, 1Fh, 2Eh added
 
-See [PC-DOS 1.10 Documentation](../../../../../pubs/pc/software/dos/PCDOS110/) for more information.
+See [PC-DOS 1.10 Documentation](/pubs/pc/software/dos/PCDOS110/) for more information.
diff --git a/disks/pc/dos/microsoft/4.0M/README.md b/disks/pc/dos/microsoft/4.0M/README.md
index 29a6418f4..bfa7bcb34 100644
--- a/disks/pc/dos/microsoft/4.0M/README.md
+++ b/disks/pc/dos/microsoft/4.0M/README.md
@@ -19,14 +19,14 @@ More information is available at
 [MSDN Blogs](http://blogs.msdn.com/b/larryosterman/archive/2004/03/22/94209.aspx).
 
 Note: The designation "4.0M" is not an official version number; it's an internal version number used only to
-differentiate these disk images from those of the official MS-DOS 4.00 release in July 1988. 
+differentiate these disk images from those of the official MS-DOS 4.00 release in October 1988.
 
 The [IBM Model 5160](/devices/pc/machine/) machine configuration below boots MS-DOS 4.0M.  To access the MS-DOS
 "Session Manager" after it's booted, tap the **Alt** key.
 
 {% include machine.html id="ibm5160" %}
 
-Additional Information From [PC DOS Retro](https://sites.google.com/site/pcdosretro/multitaskingdos4) by Vernon Brooks
+Additional Information From [PC DOS Retro](https://sites.google.com/site/pcdosretro/multitaskingdos4)
 ---
 
 Multitasking MS-DOS 4.0 was a little known and separate development of DOS done in parallel with the development