diff --git a/source/Demos/LunarSim.rst b/source/Demos/LunarSim.rst
index 4d1af66..209ded6 100644
--- a/source/Demos/LunarSim.rst
+++ b/source/Demos/LunarSim.rst
@@ -20,7 +20,7 @@ Then build lunar_sim demo images:
 
 .. code-block:: bash
 
-  cd ../lunar_sim
+  cd lunarsim_demo
   ./build.sh