chg: [pibs] Updated README

README.md

@@ -21,11 +21,12 @@ make
 ``` shell
 ./pibs -r pcapfile.cap -b
 
-./pibs -u e344c4fb-442e-45a6-92b9-d8e30aeef448 -z 127.0.0.1 -p 6379
+./pibs -u e344c4fb-442e-45a6-92b9-d8e30aeef448 -z 127.0.0.1 -p 6379 -y 2
 
 Consumes the files from the worker queue and write potential backscatter on
 standard output. The worker queue should include absolute filenames.
 In the example the redis server server is listening on port 6379 on the interface 127.0.0.1.
+The redis database 2 is used as specified with the -y option.
 The string e344c4fb-442e-45a6-92b9-d8e30aeef448 is the uuid that must be inline with the
 worker.