diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 6fcbd56cc6..f8b337c0d0 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4265,7 +4265,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 			     "@,48-57,/,\,.,-,_,+,,,#,$,%,{,},[,],:,@-@,!,~,="
 			    for AMIGA: "@,48-57,/,.,-,_,+,,,$,:"
 			    for VMS: "@,48-57,/,.,-,_,+,,,#,$,%,<,>,[,],:,;,~"
-			    for OS/390: "@,240-249,/,.,-,_,+,,,#,$,%,~,="
 			    otherwise: "@,48-57,/,.,-,_,+,,,#,$,%,~,=")
 			global
 			{not in Vi}
diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index 942fbb685e..a3abd2cfd3 100644
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -138,7 +138,6 @@ Support for different systems.
 	- Windows 95 and Windows NT, with support for long file names.
 	- VMS
 	- Macintosh
-	- IBM OS/390
 	Note that on some systems features need to be disabled to reduce
 	resource usage, esp. on MS-DOS.  For some outdated systems you need to
 	use an older Vim version.