Minor clarification, saying that blocking means no timeout (from bug #882297)
diff --git a/Doc/lib/libsocket.tex b/Doc/lib/libsocket.tex
index e9c853a..e0ce0a5 100644
--- a/Doc/lib/libsocket.tex
+++ b/Doc/lib/libsocket.tex
@@ -548,7 +548,7 @@
The file object references a \cfunction{dup()}ped version of the
socket file descriptor, so the file object and socket object may be
closed or garbage-collected independently.
-The socket must be in blocking mode.
+The socket must be in blocking mode (it can not have a timeout).
\index{I/O control!buffering}The optional \var{mode}
and \var{bufsize} arguments are interpreted the same way as by the
built-in \function{file()} function; see ``Built-in Functions''