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diff --git a/doc/man/libkeccak_hmac_copy.3 b/doc/man/libkeccak_hmac_copy.3
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+.TH LIBKECCAK_HMAC_COPY 3 LIBKECCAK-%VERSION%
+.SH NAME
+libkeccak_hmac_copy - Copies an HMAC-hashing state
+.SH SYNOPSIS
+.LP
+.nf
+#include <libkeccak.h>
+.P
+int libkeccak_hmac_copy(libkeccak_hmac_state_t *\fIdest\fP,
+                        const libkeccak_hmac_state_t *\fIsrc\fP);
+.fi
+.P
+Link with \fI-lkeccak\fP.
+.SH DESCRIPTION
+The
+.BR libkeccak_hmac_copy ()
+function initialises \fI*dest\fP to be identical to \fI*src\fP.
+This includes all members of the \fBlibkeccak_hmac_state_t\fP
+structure, including the state of the sponge and the
+message chunk buffer.
+.SH RETURN VALUES
+The
+.BR libkeccak_hmac_copy ()
+function returns 0 upon successful completion.
+On error, -1 is returned and \fIerrno\fP is set to describe
+the error.
+.SH ERRORS
+The
+.BR libkeccak_hmac_copy ()
+function may fail for any specified for the function
+.BR malloc (3).
+.SH SEE ALSO
+.BR libkeccak_hmac_duplicate (3),
+.BR libkeccak_hmac_initialise (3)
+.SH AUTHORS
+Principal author, Mattias Andrée.  See the LICENSE file for the full
+list of authors.
+.SH BUGS
+Please report bugs to https://github.com/maandree/libkeccak/issues or to
+maandree@member.fsf.org
diff --git a/doc/man/libkeccak_hmac_duplicate.3 b/doc/man/libkeccak_hmac_duplicate.3
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+.TH LIBKECCAK_HMAC_DUPLICATE 3 LIBKECCAK-%VERSION%
+.SH NAME
+libkeccak_hmac_duplicate - Allocate a duplicate an HMAC-hashing state
+.SH SYNOPSIS
+.LP
+.nf
+#include <libkeccak.h>
+.P
+libkeccak_hmac_state_t *libkeccak_hmac_duplicate(const libkeccak_hmac_state_t *\fIsrc\fP);
+.fi
+.P
+Link with \fI-lkeccak\fP.
+.SH DESCRIPTION
+The
+.BR libkeccak_hmac_duplicate ()
+function allocates a new hash state and initialises it to be identical
+to \fI*src\fP. This includes all members of the \fBlibkeccak_hmac_state_t\fP
+structure, including the state of the sponge and the message
+chunk buffer.
+.SH RETURN VALUES
+The
+.BR libkeccak_hmac_duplicate ()
+function returns a newly allocated \fIlibkeccak_hmac_t*\fP
+(of one initialised element) upon successful completion.
+On error, \fINULL\fP is returned and \fIerrno\fP is set to
+describe the error.
+.SH ERRORS
+The
+.BR libkeccak_hmac_duplicate ()
+function may fail for any specified for the function
+.BR malloc (3).
+.SH SEE ALSO
+.BR libkeccak_hmac_copy (3),
+.BR libkeccak_hmac_create (3)
+.SH AUTHORS
+Principal author, Mattias Andrée.  See the LICENSE file for the full
+list of authors.
+.SH BUGS
+Please report bugs to https://github.com/maandree/libkeccak/issues or to
+maandree@member.fsf.org