diff --git a/.gitignore b/.gitignore
index d9fa69d..6a456fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,10 @@
 /tmp/
 /.direnv/
 
+/venv/
+
 /debug/
 /target/
-/crates/*/target/
 
 __pycache__
 
diff --git a/Makefile b/Makefile
index 71ca7f0..e47c4ce 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,7 @@
 .PHONY: check rust-check rust-check-fmt rust-fmt
+.PHONY: create-venv build
+
+all: check build
 
 check: rust-check rust-check-fmt
 
@@ -10,3 +13,12 @@ rust-check-fmt:
 
 rust-fmt:
 	cargo fmt --all
+
+create-venv:
+	python3 -m venv venv
+	@echo "Enter venv with:"
+	@echo "source venv/bin/activate"
+
+build:
+	cd crates/benda; \
+		maturin develop
diff --git a/examples/simple.py b/examples/simple.py
index a35d7e0..1bed79b 100644
--- a/examples/simple.py
+++ b/examples/simple.py
@@ -1,11 +1,8 @@
-import ast
-import inspect
-
 import benda
-from benda import u24
+from benda import bjit, u24
 
 
-def simple():
+def simple() -> u24:
     x = u24(3)
     y = x - u24(2)
     return y