diff --git a/3D-OpenGL-Rendering-Engine.md b/3D-OpenGL-Rendering-Engine.md
index 17ee58d..9e914bd 100644
--- a/3D-OpenGL-Rendering-Engine.md
+++ b/3D-OpenGL-Rendering-Engine.md
@@ -1,8 +1,12 @@
 Rendering engine based on pure OpenGL code, that can simulate simple 3D scenes, including the possibility to simulate dynamic objects moving in the scene.
 
 ## Run
+First set the absolute paths in `example.conf`:
 
-Run the simulator as follows (do not forget to set the absolute paths in `opengl.conf`):
+    roscd esim_ros
+    gedit cfg/example.conf 
+
+Run the simulator as follows:
 
     roslaunch esim_ros esim.launch config:=cfg/opengl.conf