Link to a web page; @var{url} is a string which specifies the
@acronym{URL}. The link appears in the customization buffer as
@var{url} and invokes the WWW browser specified by
-@var{browse-url-browser-function}.
+@code{browse-url-browser-function}.
@item (emacs-commentary-link @var{library})
Link to the commentary section of a library; @var{library} is a string
@defmac defgroup group members doc [keyword value]@dots{}
Declare @var{group} as a customization group containing @var{members}.
Do not quote the symbol @var{group}. The argument @var{doc} specifies
-the documentation string for the group. It should not start with a
-@samp{*} as in @code{defcustom}; that convention is for variables only.
+the documentation string for the group.
The argument @var{members} is a list specifying an initial set of
customization items to be members of the group. However, most often
@defmac defcustom option default doc [keyword value]@dots{}
Declare @var{option} as a customizable user option variable. Do not
quote @var{option}. The argument @var{doc} specifies the documentation
-string for the variable. It should often start with a @samp{*} to mark
-it as a @dfn{user option} (@pxref{Defining Variables}). Do not start
-the documentation string with @samp{*} for options which cannot or
-normally should not be set with @code{set-variable}; examples of the
-former are global minor mode options such as
-@code{global-font-lock-mode} and examples of the latter are hooks.
+string for the variable. There is no need to start it with a @samp{*}
+because @code{defcustom} automatically marks @var{option} as a
+@dfn{user option} (@pxref{Defining Variables}).
If @var{option} is void, @code{defcustom} initializes it to
@var{default}. @var{default} should be an expression to compute the