diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index f8949f6..69c6c5d 100644
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -133,14 +133,10 @@
 	- All Unix systems (it works on all systems it was tested on, although
 	  the GUI and Perl interface may not work everywhere).
 	- Amiga (500, 1000, 1200, 2000, 3000, 4000, ...).
-	- MS-DOS in real-mode (no additional drivers required).
-	- In protected mode on Windows 3.1 and MS-DOS (DPMI driver required).
-	- Windows 95 and Windows NT, with support for long file names.
-	- OS/2 (needs emx.dll)
+	- MS-Windows
 	- VMS
 	- BeOS
 	- Macintosh
-	- Risc OS
 	- IBM OS/390
 	Note that on some systems features need to be disabled to reduce
 	resource usage.  For some outdated systems you need to use an older