Use the standard expression for the availability statement for alarm().

freddrake · freddrake · commit e73ad2a21f99 · 2002-02-15T20:59:43.000Z
diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
@@ -103,8 +103,9 @@ \section{\module{signal} ---
   If \var{time} is zero, no alarm id scheduled, and any scheduled
   alarm is canceled.  The return value is the number of seconds
   remaining before a previously scheduled alarm.  If the return value
-  is zero, no alarm is currently scheduled.  Not on Windows.  (See the
-  \UNIX{} man page \manpage{alarm}{2}.)
+  is zero, no alarm is currently scheduled.  (See the \UNIX{} man page
+  \manpage{alarm}{2}.)
+  Availability: \UNIX.
 \end{funcdesc}
 
 \begin{funcdesc}{getsignal}{signalnum}
