diff --git a/Multi-Objects-2D-renderer.md b/Multi-Objects-2D-renderer.md
index fd9c567..2d593eb 100644
--- a/Multi-Objects-2D-renderer.md
+++ b/Multi-Objects-2D-renderer.md
@@ -1,6 +1,10 @@
 A simple 2D rendering engine that simulates several 2D objects moving over a planar background.
 
 ## Example
+First set the absolute paths in `multi_objects.conf`:
+
+    roscd esim_ros
+    gedit cfg/multi_objects.conf
 
 To run the example: