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+tsig-keygen.py
+==============
+
+```
+usage: tsig-keygen.py [-h] [-a {hmac-sha256,hmac-sha384,hmac-sha512}]
+                      [-d DIRECTORY] [-f {bind9,nsd}] [-k KEY] [-n NAME]
+                      [-o OUTPUT] [-s SERVERS [SERVERS ...]]
+                      [-z ZONES [ZONES ...]]
+
+Pure Python TSIG key generator with multiple output formats.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -a {hmac-sha256,hmac-sha384,hmac-sha512}, --algorithm {hmac-sha256,hmac-sha384,hmac-sha512}
+                        TSIG algorithm
+  -d DIRECTORY, --directory DIRECTORY
+                        where to store secondary zone files
+  -f {bind9,nsd}, --format {bind9,nsd}
+                        output format (default: nsd
+  -k KEY, --key KEY     TSIG shared secret (default: generate new secret)
+  -n NAME, --name NAME  DNS name for TSIG shared secret
+  -o OUTPUT, --output OUTPUT
+                        output file
+  -s SERVERS [SERVERS ...], --servers SERVERS [SERVERS ...]
+                        address(es) of primary nameserver(s)
+  -z ZONES [ZONES ...], --zones ZONES [ZONES ...]
+                        zone(s) to xfr from specified nameserver(s)
+```