Use prefix argument in `info-display-manual'

* lisp/info.el (info-display-manual): Limit the completion alternatives
to currently visited manuals if prefix argument is non-nil.

1 files changed, 4 insertions, 1 deletions

diff --git a/doc/misc/info.texi b/doc/misc/info.texi
index a3a14a35b80..0e2e64f2356 100644
--- a/doc/misc/info.texi
+++ b/doc/misc/info.texi
@@ -1151,7 +1151,10 @@ switches to the buffer @file{*info*<2>}, creating it if necessary.
   If you have created many Info buffers in Emacs, you might find it
 difficult to remember which buffer is showing which manual.  You can
 use the command @kbd{M-x info-display-manual} to show an Info manual
-by name, reusing an existing buffer if there is one.
+by name, reusing an existing buffer if there is one.  When given a
+prefix argument, this command limits the completion alternatives to
+currently visited info files, thus giving a convenient way to switch
+between several manuals.
 
 @node Emacs Info Variables
 @section Emacs Info-mode Variables