diff --git a/content/en/modes/nix.md b/content/en/modes/nix.md
new file mode 100644
index 0000000..94fdcd3
--- /dev/null
+++ b/content/en/modes/nix.md
@@ -0,0 +1,9 @@
+---
+title: Nix mode
+---
+
+Lem has a built-in Nix mode.
+
+It does syntax highlighting and automatic indentation.
+
+You can find it in [extensions/nix-mode/nix-mode.lisp](https://github.com/lem-project/lem/blob/main/extensions/nix-mode/nix-mode.lisp).
diff --git a/content/en/modes/supported_languages.md b/content/en/modes/supported_languages.md
index 051a78c..91710fb 100644
--- a/content/en/modes/supported_languages.md
+++ b/content/en/modes/supported_languages.md
@@ -9,7 +9,7 @@ To see all supported languages and modes, see Lem's [extensions directory](https
 
 Languages include: asm, C, Dart, Go, Haskell, HTML and CSS, Java, JavaScript, Common Lisp, Scheme, Nim, OCaml, Python, Rust, Scala, Swift, Shell, Lua, SQL, Ruby, Erlang, Elixir…
 
-Other modes include: asciidoc, dot, JSON, LSP, Makefile, paredit, patch, posix-shell, review, VI, yaml…
+Other modes include: asciidoc, dot, JSON, LSP, Makefile, nix, paredit, patch, posix-shell, review, VI, yaml…
 
 Please choose a mode on the sidebar to see more!