@section @code{sigaddset}
@findex sigaddset
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/sigaddset.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/sigaddset.html}
Gnulib module: sigprocmask