Document that exdata for ENGINES is deprecated.
@@ -163,9 +163,12 @@ dup_func() should return 0 for failure and 1 for success.
=head1 HISTORY
CRYPTO_alloc_ex_data() was added in OpenSSL 3.0.
+
The signature of the dup_func() callback was changed in OpenSSL 3.0 to use the
type B<void **> for B<from_d>. Previously this parameter was of type B<void *>.
+Support for ENGINE "exdata" was deprecated in OpenSSL 3.0.
+
=head1 COPYRIGHT
Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
