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-rw-r--r--doc/man3/EVP_desx_cbc.pod4
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diff --git a/doc/man3/EVP_desx_cbc.pod b/doc/man3/EVP_desx_cbc.pod
index c9e250f34c..2a41e08898 100644
--- a/doc/man3/EVP_desx_cbc.pod
+++ b/doc/man3/EVP_desx_cbc.pod
@@ -23,6 +23,10 @@ All modes below use a key length of 128 bits and acts on blocks of 128-bits.
The DES-X algorithm in CBC mode.
+This algorithm is not provided by the OpenSSL default provider.
+To use it is necessary to load either the OpenSSL legacy provider or another
+implementation.
+
=back
=head1 RETURN VALUES