diff --git a/man3/pthread_sigmask.3 b/man3/pthread_sigmask.3
index f608fd763..c8d73a088 100644
--- a/man3/pthread_sigmask.3
+++ b/man3/pthread_sigmask.3
@@ -23,7 +23,7 @@
 .\" the source, must acknowledge the copyright and authors of this work.
 .\" %%%LICENSE_END
 .\"
-.TH PTHREAD_SIGMASK 3 2014-02-04 "Linux" "Linux Programmer's Manual"
+.TH PTHREAD_SIGMASK 3 2014-05-19 "Linux" "Linux Programmer's Manual"
 .SH NAME
 pthread_sigmask \- examine and change mask of blocked signals
 .SH SYNOPSIS
@@ -66,6 +66,11 @@ on error, it returns an error number.
 .SH ERRORS
 See
 .BR sigprocmask (2).
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR pthread_sigmask ()
+function is thread-safe.
 .SH CONFORMING TO
 POSIX.1-2001.
 .SH NOTES