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README.md

@@ -27,7 +27,26 @@ echo "* * * * * root /usr/bin/python3 main.py macip 2>&1 | /usr/bin/logger -t fi
 
 # Usage :
 
-See `./main.py --help`.
+```
+Usage: main.py [OPTIONS] COMMAND [ARGS]...
+
+  Re2o firewall manager.
+
+  Used without command, the firewall manager will load the whole firewall
+  (i.e. the struture, the macip set and the MAC table). By default it erases
+  the current NAT table and macp set. You can choose to keep the current
+  values for these with the flags.
+
+Options:
+  --keep-nat / --dont-keep-nat    Should I keep the current NAT table ?
+  --keep-macip / --dont-keep-macip
+                                  Should I keep the current macip set ?
+  --help                          Show this message and exit.
+
+Commands:
+  macip  Load the macip set.
+  nat    Load the NAT table.
+```
 
 # Dependencies :