-when reading, and of implying the --numeric-ids option because /etc/passwd
-becomes inaccessible. When "use chroot" is false, for security reasons
+when reading, and of complicating the preservation of usernames and groups
+(you'll need to supply in-chroot versions of etc/passwd and etc/group if
+you want named-based user/group mapping to be performed).
+When "use chroot" is false, for security reasons,