Added disclaimer to the sleep() function.
diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex
index 1c9ffe9..0c28bf2 100644
--- a/Doc/lib/libtime.tex
+++ b/Doc/lib/libtime.tex
@@ -151,6 +151,11 @@
\begin{funcdesc}{sleep}{secs}
Suspend execution for the given number of seconds. The argument may
be a floating point number to indicate a more precise sleep time.
+The actual suspension time may be less than that requested because any
+caught signal will terminate the \function{sleep()} following
+execution of that signal's catching routine. Also, the suspension
+time may be longer than requested by an arbitrary amount because of
+the scheduling of other activity in the system.
\end{funcdesc}
\begin{funcdesc}{strftime}{format, tuple}