diff --git a/man3/assert.3 b/man3/assert.3
index d1269018f..3351cb55f 100644
--- a/man3/assert.3
+++ b/man3/assert.3
@@ -56,6 +56,19 @@ The message "assertion failed in file foo.c, function
 do_bar(), line 1287" is of no help at all to a user.
 .SH RETURN VALUE
 No value is returned.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR assert ()
+T}	Thread safety	MT-Safe
+.TE
+
 .SH CONFORMING TO
 POSIX.1-2001, C89, C99.
 In C89,