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-rw-r--r--doc/emacs/m-x.texi8
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diff --git a/doc/emacs/m-x.texi b/doc/emacs/m-x.texi
index c51f10a47aa..d35a8351541 100644
--- a/doc/emacs/m-x.texi
+++ b/doc/emacs/m-x.texi
@@ -58,6 +58,14 @@ Modes}). By default, no commands are excluded, but you can customize
the option @code{read-extended-command-predicate} to exclude those
irrelevant commands from completion results.
+@kindex M-S-x
+ Conversely, Emacs can exclude all commands except those that are
+particularly relevant to the current buffer. The @kbd{M-S-x} (that's
+``meta shift x'') command works just like @kbd{M-x}, but instead of
+listing all (or most) of the commands Emacs knows about, it will only
+list the commands that have been marked as ``belonging'' to the
+current major mode, or any enabled minor modes.
+
To cancel the @kbd{M-x} and not run a command, type @kbd{C-g} instead
of entering the command name. This takes you back to command level.