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diff --git a/doc/man3/EVP_aes_128_gcm.pod b/doc/man3/EVP_aes_128_gcm.pod
index 0575901503..a8c1d06b00 100644
--- a/doc/man3/EVP_aes_128_gcm.pod
+++ b/doc/man3/EVP_aes_128_gcm.pod
@@ -169,6 +169,13 @@ the XTS "tweak" value.
=back
+=head1 NOTES
+
+Developers should be aware of the negative performance implications of
+calling these functions multiple times and should consider using
+L<EVP_CIPHER_fetch(3)> instead.
+See L<crypto(7)/Performance> for further information.
+
=head1 RETURN VALUES
These functions return an B<EVP_CIPHER> structure that contains the