diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d7a553..5387bcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,8 @@ The format is based on [Keep a Changelog].
   calling major-mode. Also includes setting for `indent-tabs-mode` ([#286]).
 * [Formatter scripts](scripts/formatters) will now work on Windows if Emacs
   can find the executable defined in the shebang.
+* `nix-ts-mode` buffers are now formatted with nixfmt like `nix-mode`
+  buffers are.
 
 ### Internal
 * Major internal refactoring has occurred to make it possible to write
diff --git a/apheleia-formatters.el b/apheleia-formatters.el
index 6257e09..736c481 100644
--- a/apheleia-formatters.el
+++ b/apheleia-formatters.el
@@ -343,6 +343,7 @@ rather than using this system."
     ;; try imposing a standard by default
     (nasm-mode . asmfmt)
     (nix-mode . nixfmt)
+    (nix-ts-mode . nixfmt)
     (perl-mode . perltidy)
     (php-mode . phpcs)
     (purescript-mode . purs-tidy)