diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..c2ee221
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2026, Michael Hinz
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
index 7910342..2143677 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,34 @@ Check if the DNSKEY for given domains is the same for the primary and
 the secondary DNS server, if not, push by updating the SOA record of
 that zone with the current date and a running number.
 
+## Prerequisites
+
+- PowerDNS authoritative server
+- MySQL/MariaDB backend, and your ability to give the dnssec-fix script access
+- uv (fantastic package manager for Python)
+
+## Security
+
+The script needs the ability to reach all the nameservers mentioned in the config,
+and has to have an account on the MySQL/MariaDB server that has the SELECT and
+UPDATE privileges for the records table in the PowerDNS database.
+
+## Future ideas
+
+Or ideas for the future...
+
+- convert to Django for more features:
+  - better logging
+  - delayed action (only publish new SOA records after three mis-lookups in a row)
+  - better configurability
+- more detailed error handling, recognize timeouts and don't react to them as if
+  the script got "wrong" data
+- get the list of nameservers from DNS instead of a config file (more correct for
+  zones with varying nameserver configurations)
+
+## License
+
+This isn't a big script. It isn't a complicated script either. Actually it's more
+of a hack. So I license this code with the 3-clause BSD license.
+
 Michael Hinz - 2026-02-12