diff --git a/.helix/languages.toml b/.helix/languages.toml
new file mode 100644
index 0000000..de278bd
--- /dev/null
+++ b/.helix/languages.toml
@@ -0,0 +1,4 @@
+[[language]]
+name = "nix"
+auto-format = true
+formatter = { command = "alejandra" }