README.markdown in i2cssh-1.6.0 vs README.markdown in i2cssh-1.7.0

@@ -23,9 +23,10 @@
     -f, --file FILE                  Cluster file (one hostname per line)
     -c, --cluster CLUSTERNAME        Name of the cluster specified in ~/.i2csshrc
     -r, --rank                       Send LC_RANK with the host number as environment variable
     -m, --machines a,b,c             Comma-separated list of hosts
     -s, --sleep SLEEP                Number of seconds to sleep between creating SSH sessions
+    -X, --extra EXTRA_PARAM          Additional ssh parameters (e.g. -Xi=myidentity.pem)
 
 i2cssh will assume you want to connect to a cluster when only one host is given.
 
 For `-c` and `-m` options, the format `username@cluster` or `username@host` can be used.