diff --git a/README.md b/README.md
index b8e0868..442b57d 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ export LEAN_PATH="$LIB/mathlib4/build/lib:$LIB_MATHLIB/aesop/build/lib:$LIB_MATH
 
 LEAN_PATH=$LEAN_PATH build/bin/pantograph $@
 ```
+The provided `flake.nix` has a develop environment with Lean already setup.
 
 ## Usage