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+++ b/doc/crypto/BIO_f_md.pod
@@ -58,6 +58,12 @@ If an application needs to call BIO_gets() or BIO_puts() through
a chain containing digest BIOs then this can be done by prepending
a buffering BIO.
+Before OpenSSL 1.0.0 the call to BIO_get_md_ctx() would only work if the BIO
+had been initialized for example by calling BIO_set_md() ). In OpenSSL
+1.0.0 and later the context is always returned and the BIO is state is set
+to initialized. This allows applications to initialize the context externally
+if the standard calls such as BIO_set_md() are not sufficiently flexible.
+
=head1 RETURN VALUES
BIO_f_md() returns the digest BIO method.
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