diff --git a/man3/assert_perror.3 b/man3/assert_perror.3
index b68722180..2ff3fefd5 100644
--- a/man3/assert_perror.3
+++ b/man3/assert_perror.3
@@ -56,6 +56,19 @@ line number of the macro call, and the output of
 .IR strerror(errnum) .
 .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_perror ()
+T}	Thread safety	MT-Safe
+.TE
+
 .SH CONFORMING TO
 This is a GNU extension.
 .SH BUGS