diff --git a/README.md b/README.md
index d4a6474f..6c24fd3e 100644
--- a/README.md
+++ b/README.md
@@ -490,6 +490,7 @@ use nix
 - [end-of-file-fixer](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/end_of_file_fixer.py)
 - [fix-byte-order-marker](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/fix_byte_order_marker.py)
 - [headache](https://github.com/frama-c/headache)
+- [keep-sorted](https://github.com/google/keep-sorted)
 - [mixed-line-endings](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/mixed_line_ending.py)
 - [mkdocs-linkcheck](https://github.com/byrnereese/linkchecker-mkdocs)
 - [openapi-spec-validator](https://github.com/python-openapi/openapi-spec-validator)
diff --git a/modules/hooks.nix b/modules/hooks.nix
index 6c0425c1..72785b22 100644
--- a/modules/hooks.nix
+++ b/modules/hooks.nix
@@ -3161,6 +3161,14 @@ lib.escapeShellArgs (lib.concatMap (ext: [ "--ghc-opt" "-X${ext}" ]) hooks.fourm
             end'
           '';
         };
+      keep-sorted =
+        {
+          name = "keep-sorted";
+          description = "Language-agnostic formatter that sorts lines between two markers in a larger file.";
+          types = [ "text" ];
+          package = tools.keep-sorted;
+          entry = "${hooks.keep-sorted.package}/bin/keep-sorted";
+        };
       latexindent =
         {
           name = "latexindent";
diff --git a/nix/tools.nix b/nix/tools.nix
index 0e76215a..41a7cbe9 100644
--- a/nix/tools.nix
+++ b/nix/tools.nix
@@ -42,6 +42,7 @@
 , hlint
 , hpack
 , html-tidy
+, keep-sorted
 , luaPackages
 , lua-language-server
 , lychee
@@ -150,6 +151,7 @@ in
     hlint
     hpack
     html-tidy
+    keep-sorted
     lychee
     mdformat
     mdl