--- plugins/sudoers/sudoers.in.orig	2018-01-15 17:30:32 UTC
+++ plugins/sudoers/sudoers.in
@@ -32,6 +32,14 @@
 ##
 ## Defaults specification
 ##
+## Uncomment if needed to preserve environmental variables related to the
+## FreeBSD pkg utility and fetch.
+# Defaults     env_keep += "PKG_CACHEDIR PKG_DBDIR FTP_PASSIVE_MODE"
+##
+## Additionally uncomment if needed to preserve environmental variables
+## related to portupgrade
+# Defaults     env_keep += "PORTSDIR PORTS_INDEX PORTS_DBDIR PACKAGES PKGTOOLS_CONF"
+##
 ## You may wish to keep some of the following environment variables
 ## when running commands via sudo.
 ##
@@ -91,6 +99,9 @@ root ALL=(ALL) ALL
 ## of the user they are running the command as (root by default).
 # Defaults targetpw  # Ask for the password of the target user
 # ALL ALL=(ALL) ALL  # WARNING: only use this together with 'Defaults targetpw'
+
+## Uncomment to show on password prompt which users' password is being expected
+# Defaults passprompt="%p's password:"
 
 ## Read drop-in files from @sysconfdir@/sudoers.d
 ## (the '#' here does not indicate a comment)
