+ it() An bf(s) is used to indicate that the rule applies to the sending
+ side. When a rule affects the sending side, it prevents files from
+ being transferred. The default is for a rule to affect both sides
+ unless bf(--delete-excluded) was specified, in which case default rules
+ become sender-side only. See also the hide (H) and show (S) rules,
+ which are an alternate way to specify server-side includes/excludes.
+ it() An bf(r) is used to indicate that the rule applies to the receiving
+ side. When a rule affects the receiving side, it prevents files from
+ being deleted. See the bf(s) modifier for more info. See also the
+ protect (P) and risk (R) rules, which are an alternate way to
+ specify receiver-side includes/excludes.
+)