note that the alarm function is not available on Windows.
diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
index 144b054..f77f0a8 100644
--- a/Doc/lib/libsignal.tex
+++ b/Doc/lib/libsignal.tex
@@ -103,8 +103,8 @@
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. (See the \UNIX{} man page
- \manpage{alarm}{2}.)
+ is zero, no alarm is currently scheduled. Not on Windows. (See the
+ \UNIX{} man page \manpage{alarm}{2}.)
\end{funcdesc}
\begin{funcdesc}{getsignal}{signalnum}
@@ -120,8 +120,8 @@
\begin{funcdesc}{pause}{}
Cause the process to sleep until a signal is received; the
- appropriate handler will then be called. Returns nothing. (See the
- \UNIX{} man page \manpage{signal}{2}.)
+ appropriate handler will then be called. Returns nothing. Not on
+ Windows. (See the \UNIX{} man page \manpage{signal}{2}.)
\end{funcdesc}
\begin{funcdesc}{signal}{signalnum, handler}