Improve README.md

gp-scripts/README.md

@@ -4,6 +4,22 @@ e.g.
 
     brick-do.sh -v ge-pacs -c "sudo ls -alh" -p "/ge-pacs/data"
 
+Where `-p` is optional
+
+```
+# brick-do.sh --help
+
+A little helper script to exeucte commands on single bricks.
+
+Usage:  [OPTION]
+Mandatory:
+  -c|--COMMAND       COMMAND     the command to execute
+  -v|--volume        VOLUME      the volume of the bricks
+
+Optionial:
+  -p|--brick-path    BRICK_PATH  in case the command needs to be run in a
+                                 subdirectory of the brick path
+```
 
 # checkup.sh
 Run a quick test on the cluster and do some sanity checks. Most checks are intended to be reviewed by a human being.