diff --git a/autoemulate/simulations/projectile.py b/autoemulate/simulations/projectile.py
index a95bb26b..774cd8c9 100644
--- a/autoemulate/simulations/projectile.py
+++ b/autoemulate/simulations/projectile.py
@@ -1,4 +1,4 @@
-# from https://github.com/alan-turing-institute/mogp-emulator/blob/main/mogp_emulator/simulations/projectile.py
+# from https://github.com/alan-turing-institute/mogp-emulator/blob/main/mogp_emulator/demos/projectile.py
 import numpy as np
 from scipy.integrate import solve_ivp