diff --git a/usr.bin/what/what.1 b/usr.bin/what/what.1
index cfd5935ee214..ef901230fd0a 100644
--- a/usr.bin/what/what.1
+++ b/usr.bin/what/what.1
@@ -66,6 +66,11 @@ Exit status is 0 if any matches were found, otherwise 1.
 .Sh SEE ALSO
 .Xr ident 1 ,
 .Xr strings 1
+.Sh STANDARDS
+The
+.Nm
+utility conforms to
+.St -p1003.1-2001 .
 .Sh HISTORY
 The
 .Nm