diff --git a/flake.nix b/flake.nix
index 8fc2ffb..26a2ad6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,6 +33,7 @@
               buildInputs = [
                 rust-bin.stable.latest.default
 
+                cargo-expand
                 cargo-nextest
                 just
               ];
diff --git a/justfile b/justfile
index 3abaaee..05dc6fd 100644
--- a/justfile
+++ b/justfile
@@ -15,3 +15,6 @@ run-example example:
 test test_filter='':
     cargo nextest run -- {{ test_filter }}
 alias t := test
+
+expand path:
+    cargo expand {{ path }}