diff --git a/examples/shaders/resources/shaders/glsl120/raymarching.fs b/examples/shaders/resources/shaders/glsl120/raymarching.fs
index 8c87e8db0..463fde87e 100644
--- a/examples/shaders/resources/shaders/glsl120/raymarching.fs
+++ b/examples/shaders/resources/shaders/glsl120/raymarching.fs
@@ -1,3 +1,4 @@
+//Ported by CDM to work on older hardware.
 #version 120
 
 // Input vertex attributes (from vertex shader)