@kindex M-TAB @r{(customization buffer)}
@findex widget-complete
While editing a value or field that is a file name, directory name,
-command name, or anything else for which completion is defined, you can
-type @kbd{M-@key{TAB}} (@code{widget-complete}) to do completion.
+command name, or anything else for which completion is defined, you
+can type @kbd{M-@key{TAB}} (@code{widget-complete}) to do completion.
+(@kbd{@key{ESC} @key{TAB}} and @kbd{C-M-i} do the same thing.)
Some variables have a small fixed set of possible legitimate values.
These variables don't let you edit the value textually. Instead, an