diff --git a/modules/rust.nix b/modules/rust.nix
index d4b3876..18ba54b 100644
--- a/modules/rust.nix
+++ b/modules/rust.nix
@@ -1,8 +1,21 @@
+# We use the unofficial overlay oxalica/rust-overlay
+#   https://nixos.wiki/wiki/Rust#Unofficial_overlays
+
+# Example for oxalica/rust-overlay
+#   https://nixos.wiki/wiki/Rust#Custom_Rust_version
+
+# rust-analyzer
+#   https://rust-analyzer.github.io/
+#   rust-analyzer is an implementation of Language Server Protocol for the Rust programming language. It provides features like completion and goto definition for many code editors, including VS Code, Emacs and Vim.
+
 { config, pkgs, ... }:
 let
   #rustVersion = pkgs.rust-bin.stable."1.81.0".default.override {
   rustVersion = pkgs.rust-bin.stable.latest.default.override {
-    extensions = [ "rust-src" ];
+    extensions = [
+      "rust-src"
+      "rust-analyzer"
+    ];
     #targets = [
     #  "x86_64-unknown-linux-musl"
     #  #"arm-unknown-linux-gnueabihf"