add s

Author: vladak

threads.tex

@@ -145,7 +145,7 @@
 
 \begin{itemize}
 \item General information on POSIX is on page \pageref{POSIX}.
-\item There are more threading API, the POSIX thread API is just one of them.
+\item There are more threading APIs, the POSIX thread API is just one of them.
 For example, there is a system call \texttt{sproc()} on IRIX, then
 ifdef([[[NOSPELLCHECK]]], [[[Cthreads]]]),
 Solaris threads, GNU ifdef([[[NOSPELLCHECK]]], [[[Ptr threads]]]) (= portable),