-The \fB\-d\fP (debug) and \fB\-n\fP (no-op) options are extensions not provided
-by other implementations.
-.PP
-A \fBtabs\fP utility appeared in PWB/Unix 1.0 (1977).
-There was a reduced version of the \fBtabs\fP utility
-in Unix 7th edition and in 3BSD (1979).
-The latter supported a single \*(``\-n\*('' option
-(to cause the first tab stop to be set on the left margin).
-That option is not documented by POSIX.
+The
+.B \-d
+(debug) and
+.B \-n
+(no-op) options are
+.I \%ncurses
+extensions not provided by other implementations.
+.SH HISTORY
+A
+.B tabs
+utility appeared in PWB/Unix 1.0 (1977).
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/sys/source/s2/\
+.\" tabs.c
+A reduced version shipped in Seventh Edition Unix
+(early 1979)
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=V7/usr/src/cmd/tabs.c
+and in 3BSD
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=3BSD/usr/src/cmd/\
+.\" tabs.c
+(later the same year);
+it supported a \*(``\-n\*('' option to set the first tab stop at the
+left margin.
+That option is not specified by POSIX.