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-rw-r--r--doc/man3/EVP_PKEY_get_default_digest_nid.pod3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/man3/EVP_PKEY_get_default_digest_nid.pod b/doc/man3/EVP_PKEY_get_default_digest_nid.pod
index 4a4ca4cad4..f23552d747 100644
--- a/doc/man3/EVP_PKEY_get_default_digest_nid.pod
+++ b/doc/man3/EVP_PKEY_get_default_digest_nid.pod
@@ -18,7 +18,8 @@ EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name
EVP_PKEY_get_default_digest_name() fills in the default message digest
name for the public key signature operations associated with key
I<pkey> into I<mdname>, up to at most I<mdname_sz> bytes including the
-ending NUL byte.
+ending NUL byte. The name could be C<"UNDEF">, signifying that no digest
+should be used.
EVP_PKEY_get_default_digest_nid() sets I<pnid> to the default message
digest NID for the public key signature operations associated with key