is a
.Ql $
then the value to be set is taken from the existing environment
-variable of the same name.
+variable of the indicated name.
.El
.It Ar identity
The username to match.
If quotes or backslashes are used in a word,
it isn't considered a keyword.
.El
+.Sh FILES
+.Bl -tag -width "/etc/doas.conf"
+.It Pa /etc/doas.conf
+doas configuration file.
+.El
.Sh EXAMPLES
The following example permits user aja to install packages
from a preferred mirror;