diff --git a/.headroom.yaml b/.headroom.yaml
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+## This is the configuration file for Headroom.
+## See https://github.com/vaclavsvejcar/headroom for more details.
+
+## Defines with which version of Headroom this configuration is compatible.
+## Headroom uses this field to detect whether your configuration doesn't need
+## any manual migration steps in case that it's older than your current Headroom
+## version. You don't need to touch this field unless explicitly stated in
+## migration guide during upgrading Headroom to new version.
+version: 0.5.0.0
+
+## Defines the behaviour how to handle license headers, possible options are:
+##
+##   - add     = (default) adds license header to files with no existing header
+##               (same as '-a|--add-headers' command line argument)
+##   - drop    = drops existing license header from without replacement
+##               (same as '-d|--drop-headers' command line argument)
+##   - replace = adds or replaces existing license header
+##               (same as '-r|--replace-headers' command line argument)
+run-mode: add
+
+## Paths to source code files (either files or directories),
+## same as '-s|--source-path=PATH' command line argument (can be used multiple
+## times for more than one path).
+source-paths:
+  - .
+
+license-headers:
+  nix:
+    file-extensions: ["nix"]
+    margin-top-code: 1
+    margin-top-file: 0
+    margin-bottom-code: 1
+    margin-bottom-file: 0
+    put-after: []
+    put-before: []
+    # use a special comment so it doesn't collide with my own comments
+    block-comment:
+      starts-with: ^\/\*\*
+      ends-with: \*\/$
+
+## Allows to define list of regular expressions that will be matched against
+## 'source-paths' and such paths will be excluded from processing. Same as
+## '-e|--excluded-path=REGEX' command line argument (can be used multiple times
+## for more than one path).
+excluded-paths:
+  - ".direnv"
+  - "./result"
+
+## If set to 'true', Headroom tries to detect whether any VCS (like GIT) is used
+## for current project and if yes, it loads rules for ignored files and excludes
+## all source paths that matches these rules.
+exclude-ignored-paths: false
+
+## Paths to template files (either files or directories),
+## same as '-t|--template-path=PATH' command line argument (can be used multiple
+## times for more than one path).
+template-paths:
+  - headroom-templates
+
+## Variables (key-value) to replace in templates,
+## same as '-v|--variable="KEY=VALUE"' command line argument (can be used
+## multiple times for more than one path).
+variables:
+  author: "Léana"
+  year: "2026"
+  project: ".files"
+  email: "yrnan.wvnat+tvg@vpybhq.pbz (rot13)"
diff --git a/headroom-templates/nix.mustache b/headroom-templates/nix.mustache
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+++ b/headroom-templates/nix.mustache
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+/**
+  {{ project }}
+  Copyright (C) {{ year }} {{ author }}
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see http://www.gnu.org/licenses/.
+*/