diff --git a/Circular_kernel_3/demo/Circular_kernel_3/README b/Circular_kernel_3/demo/Circular_kernel_3/README
index 301b91e692d..8f156e3dd72 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/README
+++ b/Circular_kernel_3/demo/Circular_kernel_3/README
@@ -1,3 +1,5 @@
 To compile this demo you need to have an OpenGL library, like:
 freeglut-2.4.0
-You have to set the option -I{your OpenGL folder}/freeglut-2.4.0/include
+You have to set the option:
+-I{your OpenGL folder}/freeglut-2.4.0/include (to compile)
+-L{your OpenGL folder}/freeglut-2.4.0/src/.libs/ (to link)