--- a/bin/fjail	Thu Aug 15 15:58:24 2019 +0200
+++ b/bin/fjail	Thu Aug 15 16:07:53 2019 +0200
@@ -6,6 +6,29 @@
 
 VERSION="@@VERSION@@"
 
+USAGE="
+USAGE: fjail [ OPTIONS ] COMMAND [ COMMAND OPTIONS ] [ ARG ... ]
+
+OPTIONS:
+
+  -h    Print this help message to stdout and exit
+
+COMMANDS:
+
+  datasets [-u] PARENT CHILD
+
+    Create ZFS datasets to be used within a jail
+
+    PARENT must exist already and CHILD must not exist.
+
+    -u        Do not automatically mount newly created datasets
+
+  privs MOUNTPOINT
+
+    Adjust some Unix privileges to mounted jail datasets
+"
+
+
 # Reset to standard umask
 umask 0022
 
@@ -125,7 +148,7 @@
 while getopts "h" _opt ; do
     case ${_opt} in
         h)
-            echo "Usage: XXX TBD"
+            echo "${USAGE}"
             exit 0
             ;;
         \?|:)