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+.\" Copyright (c) 2018 Yubico AB. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions are
+.\" met:
+.\"
+.\"    1. Redistributions of source code must retain the above copyright
+.\"       notice, this list of conditions and the following disclaimer.
+.\"    2. Redistributions in binary form must reproduce the above copyright
+.\"       notice, this list of conditions and the following disclaimer in
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+.\"       distribution.
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+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+.\" HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.Dd $Mdocdate: May 23 2018 $
+.Dt FIDO_CRED_EXCLUDE 3
+.Os
+.Sh NAME
+.Nm fido_cred_exclude
+.Nd appends a credential ID to a credential's list of excluded credentials
+.Sh SYNOPSIS
+.In fido.h
+.Ft int
+.Fn fido_cred_exclude "fido_cred_t *cred" "const unsigned char *ptr" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn fido_cred_exclude
+function adds
+.Fa ptr
+to the list of credentials excluded by
+.Fa cred ,
+where
+.Fa ptr
+points to a credential ID of
+.Fa len
+bytes.
+A copy of
+.Fa ptr
+is made, and no references to the passed pointer are kept.
+If
+.Fn fido_cred_exclude
+fails, the existing list of excluded credentials is preserved.
+.Pp
+If
+.Nm
+returns success and
+.Fa cred
+is later passed to
+.Xr fido_dev_make_cred 3
+on a device that contains the credential
+denoted by
+.Fa ptr ,
+then
+.Xr fido_dev_make_cred 3
+will fail.
+.Pp
+For the format of a FIDO2 credential ID, please refer to the
+Web Authentication (webauthn) standard.
+.Sh RETURN VALUES
+The error codes returned by
+.Fn fido_cred_exclude
+are defined in
+.In fido/err.h .
+On success,
+.Dv FIDO_OK
+is returned.
+.Sh SEE ALSO
+.Xr fido_cred_new 3 ,
+.Xr fido_cred_set_authdata 3 ,
+.Xr fido_dev_make_cred 3