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-rw-r--r--Doc/lib/libthread.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/lib/libthread.tex b/Doc/lib/libthread.tex
index d302958747..6dfd8758b7 100644
--- a/Doc/lib/libthread.tex
+++ b/Doc/lib/libthread.tex
@@ -17,7 +17,9 @@ semaphores}) are provided.
The module is optional. It is supported on Windows, Linux, SGI
IRIX, Solaris 2.x, as well as on systems that have a \POSIX{} thread
-(a.k.a. ``pthread'') implementation.
+(a.k.a. ``pthread'') implementation. For systems lacking the \module{thread}
+module, the \refmodule{dummy_thread} module is available. It duplicates this
+module's interface and can be used as a drop-in replacement.
\index{pthreads}
\indexii{threads}{\POSIX}