--- zzzz-none-000/linux-3.10.107/Documentation/device-mapper/delay.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/device-mapper/delay.txt	2021-02-04 17:41:59.000000000 +0000
@@ -8,6 +8,7 @@
     <device> <offset> <delay> [<write_device> <write_offset> <write_delay>]
 
 With separate write parameters, the first set is only used for reads.
+Offsets are specified in sectors.
 Delays are specified in milliseconds.
 
 Example scripts