diff --git a/man3/wcsncpy.3 b/man3/wcsncpy.3
index 0af11a179..6f3844e11 100644
--- a/man3/wcsncpy.3
+++ b/man3/wcsncpy.3
@@ -79,6 +79,6 @@ T{
 T}	Thread safety	MT-Safe
 .TE
 .SH CONFORMING TO
-C99.
+POSIX.1-2001, POSIX.1-2008, C99.
 .SH SEE ALSO
 .BR strncpy (3)