diff --git a/.goreleaser.yaml b/.goreleaser.yaml
index 3ef71bd..7fb3801 100644
--- a/.goreleaser.yaml
+++ b/.goreleaser.yaml
@@ -53,6 +53,14 @@ archives:
   - goos: windows
     formats:
     - zip
+  # Listing files at all replaces GoReleaser's defaults, so LICENSE and README
+  # have to be repeated here. NOTICE is the reason: Apache-2.0 section 4(d)
+  # requires it to travel with every distributed copy, and it carries the
+  # upstream MIT notices this reimplementation is built on.
+  files:
+  - LICENSE
+  - NOTICE
+  - README.md
 
 notarize:
   macos:
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..f94ecba
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,51 @@
+go-pre-commit
+Copyright 2026 Blair Hamilton
+
+Licensed under the Apache License, Version 2.0. See LICENSE.
+
+--------------------------------------------------------------------------------
+
+This project is an independent Go reimplementation of the Python `pre-commit`
+framework. It is not affiliated with, endorsed by, or supported by the
+pre-commit project or its maintainers.
+
+Its observable behavior — the command-line interface, the `.pre-commit-config.yaml`
+and hook manifest schemas, environment-directory naming, cache layout, exit codes
+and output formatting — is deliberately modeled on the following MIT-licensed
+projects, and portions of this work are derived from them:
+
+  pre-commit — https://github.com/pre-commit/pre-commit
+
+    Copyright (c) 2014 pre-commit dev team: Anthony Sottile, Ken Struys
+
+  identify — https://github.com/pre-commit/identify
+
+    The file-type tag tables in internal/identify (extension, filename and
+    interpreter mappings) follow this project's data.
+
+    Copyright (c) 2017 Chris Kuehl, Anthony Sottile
+
+Both are distributed under the MIT License, reproduced in full below as required
+by its terms.
+
+--------------------------------------------------------------------------------
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
index 5dc636f..e7a3559 100644
--- a/README.md
+++ b/README.md
@@ -206,6 +206,26 @@ git push origin v4.6.7
 
 CI builds, signs, and notarizes cross-platform binaries, publishes a GitHub release, and updates the Homebrew formula in [blairham/homebrew-tap](https://github.com/blairham/homebrew-tap) automatically. Versions track upstream parity: `v4.6.x` means feature parity with Python pre-commit 4.6.
 
+## Attribution
+
+This is an independent reimplementation, not a fork and not an official
+project. It is not affiliated with, endorsed by, or supported by the pre-commit
+project or its maintainers.
+
+The behavior it copies — the CLI, the config and manifest schemas, the cache
+layout, exit codes and output formatting — is the design of two MIT-licensed
+projects, and the file-type tag tables in `internal/identify` follow upstream
+`identify`'s data:
+
+- [pre-commit](https://github.com/pre-commit/pre-commit) — © 2014 pre-commit dev
+  team: Anthony Sottile, Ken Struys
+- [identify](https://github.com/pre-commit/identify) — © 2017 Chris Kuehl,
+  Anthony Sottile
+
+Their MIT license is reproduced in [NOTICE](NOTICE). Bugs you find here are
+this project's bugs, not theirs — please report them
+[here](https://github.com/blairham/go-pre-commit/issues) rather than upstream.
+
 ## License
 
-[Apache-2.0](LICENSE)
+[Apache-2.0](LICENSE), with third-party notices in [NOTICE](NOTICE).
diff --git a/internal/identify/identify.go b/internal/identify/identify.go
index 2ca0336..e135956 100644
--- a/internal/identify/identify.go
+++ b/internal/identify/identify.go
@@ -1,4 +1,10 @@
 // Package identify provides file type identification by extension, filename, and shebang.
+//
+// The tag tables below follow the data in the MIT-licensed identify project
+// (https://github.com/pre-commit/identify, © 2017 Chris Kuehl, Anthony Sottile).
+// A hook's types/types_or/exclude_types filters are matched against these tags,
+// so a tag this project gets wrong is a hook that silently skips or wrongly
+// claims a file: when the two disagree, upstream is right. See NOTICE.
 package identify
 
 import (