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+++ b/doc/man3/EVP_ripemd160.pod
@@ -25,6 +25,13 @@ The RIPEMD-160 algorithm which produces a 160-bit output from a given input.
=back
+=head1 NOTES
+
+Developers should be aware of the negative performance implications of
+calling this function multiple times and should consider using
+L<EVP_MD_fetch(3)> instead.
+See L<crypto(7)/Performance> for further information.
+
=head1 RETURN VALUES
These functions return a B<EVP_MD> structure that contains the