-will be output if the associated attribute for the item is being updated;
-otherwise the letter will be replaced by either a "." for no change, a "+"
-for a new item, or a "?" if the attribute is not known (which happens when
-talking to an older rsync). The meanings of the attribute letters are as
-follows:
+will be output if the associated attribute for the item is being updated or
+a "." for no change. Three exceptions to this are: (1) a newly created
+item replaces each letter with a "+", (2) an identical item replaces each
+letter with a space, and (3) an unknown attribute replaces each letter with
+a "?" (this happens when talking to an older rsync).
+
+The attribute that is associated with each letter is as follows: