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diff --git a/man3/getusershell.3 b/man3/getusershell.3
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@@ -90,6 +90,14 @@ function returns a NULL pointer on end-of-file.
.nf
/etc/shells
.fi
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR getusershell (),
+.BR setusershell ()
+and
+.BR endusershell ()
+functions are not thread-safe.
.SH CONFORMING TO
4.3BSD.
.SH SEE ALSO