+applications that want repeatable block and file checksums, or
+in the case where the user wants a more random checksum seed.
+Note that setting NUM to 0 causes rsync to use the default of time()
-+for checksum seed. Note also that --write-batch and --read-batch
-+set the checksum seed to 32761, so --checksum-seed=NUM needs to
++for checksum seed. Note also that bf(--write-batch) and bf(--read-batch)
++set the checksum seed to 32761, so bf(--checksum-seed=NUM) needs to
+follow these options if you want to specify a different checksum
+seed in batch mode.