@item F
A file name. The file need not exist. Completion, Default, Prompt.
+@item G
+A file name. The file need not exist. If the user enters just a
+directory name, then the value is just that directory name, with no
+file name within the directory added. Completion, Default, Prompt.
+
@item i
An irrelevant argument. This code always supplies @code{nil} as
the argument's value. No I/O.
maps. The key sequence argument is represented as a string or vector.
The cursor does not move into the echo area. Prompt.
-If the key sequence is a down-event, the following up-event is discarded,
-but can be read via the @code{U} code character.
+If @samp{k} reads a key sequence that ends with a down-event, it also
+reads and discards the following up-event. You can get access to that
+up-event with the @samp{U} code character.
This kind of input is used by commands such as @code{describe-key} and
@code{global-set-key}.
parentheses and brackets) do not do so here. Prompt.
@item U
-A key sequence or @code{nil}. May be used after a @code{k} or @code{K}
-argument to get the up-event that was discarded in case the key
-sequence read for that argument was a down-event. No I/O.
+A key sequence or @code{nil}. Can be used after a @samp{k} or
+@samp{K} argument to get the up-event that was discarded (if any)
+after @samp{k} or @samp{K} read a down-event. If no up-event has been
+discarded, @samp{U} provides @code{nil} as the argument. No I/O.
@item v
A variable declared to be a user option (i.e., satisfying the
@item X
@cindex evaluated expression argument
-A Lisp form is read as with @kbd{x}, but then evaluated so that its
-value becomes the argument for the command. Prompt.
+A Lisp form's value. @samp{X} reads as @samp{x} does, then evaluates
+the form so that its value becomes the argument for the command.
+Prompt.
@item z
A coding system name (a symbol). If the user enters null input, the