-The XSI Curses standard, Issue 4, describes these functions. It changes the
-argument type of the attribute-manipulation functions \fBslk_attron\fR,
-\fBslk_attroff\fR, \fBslk_attrset\fR to be \fBattr_t\fR, and adds \fBconst\fR
-qualifiers. The format codes \fB2\fR and \fB3\fR for \fBslk_init()\fR and the
+The XSI Curses standard, Issue 4, described the soft-key functions,
+with some differences from SVr4 curses:
+.bP
+It added functions like the SVr4
+attribute-manipulation functions \fBslk_attron\fR,
+\fBslk_attroff\fR, \fBslk_attrset\fR,
+but which use \fBattr_t\fR parameters (rather than \fBchtype\fP),
+along with a reserved \fIopts\fP parameter.
+.IP
+Two of these new functions (unlike the SVr4 functions) have no provision
+for color: \fBslk_attr_on\fP and \fBslk_attr_off\fP.
+.IP
+The third function (\fBslk_attr_set\fP) has a color-pair parameter.
+.bP
+It added \fBconst\fR qualifiers to parameters (unnecessarily), and
+.bP
+It added \fBslk_color\fP.
+.PP
+The format codes \fB2\fR and \fB3\fR for \fBslk_init\fR and the