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diff --git a/src/lib/libcrypto/doc/DH_size.pod b/src/lib/libcrypto/doc/DH_size.pod
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+++ b/src/lib/libcrypto/doc/DH_size.pod
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+=pod
+
+=head1 NAME
+
+DH_size - get Diffie-Hellman prime size
+
+=head1 SYNOPSIS
+
+ #include <openssl/dh.h>
+
+ int DH_size(DH *dh);
+
+=head1 DESCRIPTION
+
+This function returns the Diffie-Hellman size in bytes. It can be used
+to determine how much memory must be allocated for the shared secret
+computed by DH_compute_key().
+
+B<dh-E<gt>p> must not be B<NULL>.
+
+=head1 RETURN VALUE
+
+The size in bytes.
+
+=head1 SEE ALSO
+
+L<dh(3)|dh(3)>, L<DH_generate_key(3)|DH_generate_key(3)>
+
+=head1 HISTORY
+
+DH_size() is available in all versions of SSLeay and OpenSSL.
+
+=cut