--- plugins/sudoers/sudoers.in.orig	2015-07-15 18:44:07 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.
 ##