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-rw-r--r--doc/man1/pkeyutl.pod7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/man1/pkeyutl.pod b/doc/man1/pkeyutl.pod
index 3a7f31b894..1829435f5b 100644
--- a/doc/man1/pkeyutl.pod
+++ b/doc/man1/pkeyutl.pod
@@ -341,6 +341,13 @@ This sets the ID string used in SM2 sign or verify operations. While verifying
an SM2 signature, the ID string must be the same one used when signing the data.
Otherwise the verification will fail.
+=item B<sm2_hex_id:hex_string>
+
+This sets the ID string used in SM2 sign or verify operations. While verifying
+an SM2 signature, the ID string must be the same one used when signing the data.
+Otherwise the verification will fail. The ID string provided with this option
+should be a valid hexadecimal value.
+
=back
=head1 EXAMPLES