diff --git a/runtime/doc/usr_05.txt b/runtime/doc/usr_05.txt
index 3b43f7e..2cfff24 100644
--- a/runtime/doc/usr_05.txt
+++ b/runtime/doc/usr_05.txt
@@ -44,7 +44,7 @@
 
 	~/.vimrc ~
 
-For MS-DOS and MS-Windows you can use one of these:
+For MS-Windows you can use one of these:
 
 	$HOME/_vimrc ~
 	$VIM/_vimrc ~
@@ -476,7 +476,6 @@
 	Amiga		s:vimfiles/plugin
 	Macintosh	$VIM:vimfiles:plugin
 	Mac OS X	~/.vim/plugin/
-	RISC-OS		Choices:vimfiles.plugin
 
 Example for Unix (assuming you didn't have a plugin directory yet): >
 
@@ -535,9 +534,9 @@
 which can be anything.  If you use "otherstuff.vim" it wouldn't work, it would
 be loaded for the "otherstuff" filetype.
 
-On MS-DOS you cannot use long filenames.  You would run into trouble if you
-add a second plugin and the filetype has more than six characters.  You can
-use an extra directory to get around this: >
+On MS-DOS like filesystems you cannot use long filenames.  You would run into
+trouble if you add a second plugin and the filetype has more than six
+characters.  You can use an extra directory to get around this: >
 
 	mkdir $VIM/vimfiles/ftplugin/fortran
 	copy thefile $VIM/vimfiles/ftplugin/fortran/too.vim
@@ -586,7 +585,7 @@
 	:!mkdir ~/.vim/plugin
 	:!cp /tmp/doit.vim ~/.vim/plugin
 
-The "cp" command is for Unix, on MS-DOS you can use "copy".
+The "cp" command is for Unix, on MS-Windows you can use "copy".
 
 Now create a "doc" directory in one of the directories in 'runtimepath'. >