- "Toggle appearance of fringes on all frames.
-Valid values for MODE include `none', `default', `left-only',
-`right-only', `minimal' and `half'. MODE can also be a cons cell
-where the integer in car will be used as left fringe width and the
-integer in cdr will be used as right fringe width. If MODE is not
-specified, the user is queried.
-It applies to all frames that exist and frames to be created in the
-future.
-If you want to set appearance of fringes on the selected frame only,
-see `set-fringe-style'."
+ "Set the default appearance of fringes on all frames.
+
+When called interactively, query the user for MODE. Valid values
+for MODE include `none', `default', `left-only', `right-only',
+`minimal' and `half'.
+
+When used in a Lisp program, MODE can be a cons cell where the
+integer in car specifies the left fringe width and the integer in
+cdr specifies the right fringe width. MODE can also be a single
+integer that specifies both the left and the right fringe width.
+If a fringe width specification is nil, that means to use the
+default width (8 pixels). This command may round up the left and
+right width specifications to ensure that their sum is a multiple
+of the character width of a frame. It never rounds up a fringe
+width of 0.
+
+Fringe widths set by `set-window-fringes' override the default
+fringe widths set by this command. This command applies to all
+frames that exist and frames to be created in the future. If you
+want to set the default appearance of fringes on the selected
+frame only, see the command `set-fringe-style'."