diff --git a/.changeset/drop-darwin-flake.md b/.changeset/drop-darwin-flake.md
new file mode 100644
index 0000000..61e0237
--- /dev/null
+++ b/.changeset/drop-darwin-flake.md
@@ -0,0 +1,5 @@
+---
+"@systemfsoftware/claude-code-comment-checker": none
+---
+
+Drop darwin/macOS from the Nix flake systems list and from the install/distribution docs; macOS is no longer a build or distribution target. No change to the package's observable behavior.
diff --git a/CONCEPTS.md b/CONCEPTS.md
index 9069067..e9ac802 100644
--- a/CONCEPTS.md
+++ b/CONCEPTS.md
@@ -51,10 +51,10 @@ identity at runtime and spawns the binary — the only package that declares a
 bin.
 
 ### Platform package
-One per os-cpu pair (`-linux-x64`, `-darwin-arm64`, …), generated from
+One per os-cpu pair (`-linux-x64`, `-linux-arm64`, …), generated from
 `scripts/lib/targets.json`: ships only the compiled binary and its
 manifest (`os`/`cpu`/`libc` fields, no `bin`). The launcher's
-`optionalDependencies` pins all five to the release version.
+`optionalDependencies` pins all three to the release version.
 
 The committed launcher manifest never lists these packages as
 `optionalDependencies` — pnpm cannot lock the platform packages
diff --git a/flake.nix b/flake.nix
index 0686ab4..ad4e96f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,7 +11,7 @@
 
   outputs = { self, nixpkgs, rust-overlay }:
     let
-      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      systems = [ "x86_64-linux" "aarch64-linux" ];
       forAllSystems = f:
         nixpkgs.lib.genAttrs systems
           (system:
@@ -67,8 +67,8 @@
           # would run the whole suite inside the nix sandbox.
           doCheck = false;
           TSLP_SOURCE_BUNDLE_URL = "file://${tslpBundle}/parser-sources.tar.zst";
-          # cargo defaults CARGO_HOME to $HOME/.cargo. Without a sandbox (the
-          # macOS default) nix's HOME=/homeless-shelter is the real host path,
+          # cargo defaults CARGO_HOME to $HOME/.cargo. Without a sandbox
+          # nix's HOME=/homeless-shelter is the real host path,
           # so the build would create it and every later rebuild would fail
           # nix's purity check. Keep cargo's home inside the build directory.
           preBuild = ''
@@ -78,7 +78,7 @@
             description = "Claude Code PostToolUse hook that flags unnecessary comments";
             homepage = "https://github.com/systemfsoftware/comment-checker";
             license = licenses.asl20;
-            platforms = platforms.unix;
+            platforms = platforms.linux;
           };
         };
       mkBwrap = pkgs: commentChecker:
diff --git a/npm/packages/comment-checker/README.md b/npm/packages/comment-checker/README.md
index e1b86c5..b07139f 100644
--- a/npm/packages/comment-checker/README.md
+++ b/npm/packages/comment-checker/README.md
@@ -5,7 +5,7 @@
 
 `@systemfsoftware/claude-code-comment-checker` is the npm distribution launcher for `comment-checker`, a standalone `PostToolUse` hook for Claude Code that classifies code comments as justified or unnecessary across 37 programming languages.
 
-It downloads or executes native platform binaries for Linux, macOS, and Windows via optional platform dependencies. Without `--strip`, it never modifies files on disk and performs all parsing and classification offline.
+It downloads or executes native platform binaries for Linux and Windows via optional platform dependencies. Without `--strip`, it never modifies files on disk and performs all parsing and classification offline.
 
 ## Quick Start
 
diff --git a/scripts/tools/check-matrix.ts b/scripts/tools/check-matrix.ts
index 5c49505..93a1c62 100755
--- a/scripts/tools/check-matrix.ts
+++ b/scripts/tools/check-matrix.ts
@@ -100,7 +100,7 @@ function checkManifest(manifest: LauncherManifest, targets: Target[]) {
   const declaredNames = Object.keys(manifest.optionalDependencies ?? {})
   if (declaredNames.length === 0) {
     note(
-      'launcher manifest carries no optionalDependencies in-tree; the shared release toolchain injects the five platform pins from targets.json when the launcher is packaged',
+      'launcher manifest carries no optionalDependencies in-tree; the shared release toolchain injects the three platform pins from targets.json when the launcher is packaged',
     )
   } else {
     const missingNames = expectedNames.filter((name) => !declaredNames.includes(name))