improve README

diff --git a/README.md b/README.md
index 2ca64bd..baaf222 100644 (file)
--- a/README.md
+++ b/README.md
@@ -3,10 +3,11 @@ name/brand: Брелок Гейгера.
 
 The tool was developed for FreeBSD but it should be very easy to port it on
 Linux.
+Prerequisites: libhidapi (FreeBSD ports: comms/hidapi,
+                          http://www.signal11.us/oss/hidapi/)
 
 trinketd [-d] [-p pidfile] [-P period] [-D datadir] [-i tics] [-l logfile]
-
--i d        - daemonize
+-d          - daemonize
 -p pidfile  - create a pid-file
 -P period   - collection period, in seconds, default 300 secs
 -D datadir  - directory to place output file, default stdout