may be one of the following:
.Pp
.Bl -tag -width "safe"
-.It vis
-The default encoding described above.
.It safe
+This is the default encoding for
+.Nm syslog
+output.
Encodes backspace characters as ^H.
Carriage returns are mapped to newlines.
A tab character is appended after newlines so that message text is indented.
+.It vis
+The C-style backslash encoding similar to that produced by the
+.Dq vis -c
+command, as described above.
.It none
No encoding is used.
.El
.Dq none
options may be garbled or subject to manipulation through the use of control characters and control sequences
embedded in user-supplied message text.
-The default
+The
.Dq vis
encoding should be used to view messages if there is any suspicion
that message text may have been used to manipulate the printed representation.