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+# he-dyndns
+A Python-based script to update dynamic DNS records when using the
+Hurricant Electric DNS service at ``dns.he.net``. This code is
+designed to ba maximally portable by relying on standard
+Python 3 libraries. It is not compatible with Python 2.
+
+# Installation
+There is really nothing to install unless you need to add
+Python3 stock libraries to your system. Copy he-dyndns somewhere useful
+such as `/usr/local/bin`.
+
+For Debian/Ubuntu systems: ``apt install python3-dns python3-dnspython python3-urllib3``
+
+For Fedora systems: ``dnf install python3-dns python3-urllib3``
+
+# Configuration
+Unless using the ``--key`` argument, keys for the dyanmic record
+are read from ``/etc/he-dyndns.conf`` or from an alternative
+location specified by ``--keyfile``. The configuration file
+format is one section [keys] with record = key pairs. For example:
+
+```
+[keys]
+dynamic.example.com = 123412341234
+```
+
+Other configuration sections will be ignored.
+
+# Usage
+```
+usage: he-dyndns [-h] [--v4] [--v6] [--addr4 ADDR4] [--addr6 ADDR6] [--key KEY] [--debug] record
+
+Update Hurricane Electric DNS dynamic record
+
+positional arguments:
+  record             DNS record to update
+
+optional arguments:
+  -h, --help         show this help message and exit
+  --v4               Update IPv4 A record (default)
+  --v6               Update IPv6 AAAA record
+  --addr4 ADDR4      Update A record with provided IP rather than detected IP
+  --addr6 ADDR6      Update AAAA record with provided IP rather than detected IP
+  --keyfile KEYFILE  Alternate location for key config file (default /etc/he-dns-secret.conf)
+  --key KEY          HE DDNS key for record (by default read from /etc/he-dns-secret.conf or --keyfile)
+  --debug            Enable debug logging
+
+```
+
+# Return Values
+Returns 0 on success (successful change or no change) or 1 on failure. 
+Failures also include a single line error message.