diff --git a/src/tea3/cli.py b/src/tea3/cli.py
index bd55550..b1a315b 100644
--- a/src/tea3/cli.py
+++ b/src/tea3/cli.py
@@ -34,7 +34,7 @@ def main() -> None:
     for i in range(steps):
         model.step()
         poly = model.R_bits[reg][bit]
-        print(f"\n[Step {i}]  R_bits[{reg}][{bit}] =")
+        print(f"\n[Step {i+1}]  R_bits[{reg}][{bit}] =")
         print(pretty_print(poly))
 
     print("\n" + "=" * 50)