diff --git a/src/4.advanced_opengl/1.depth_testing/depth_testing.frag b/src/4.advanced_opengl/1.depth_testing/depth_testing.frag
index 5f3992f..06169f4 100644
--- a/src/4.advanced_opengl/1.depth_testing/depth_testing.frag
+++ b/src/4.advanced_opengl/1.depth_testing/depth_testing.frag
@@ -1,16 +1,16 @@
 #version 330 core
 out vec4 color;
 
-float LinearizeDepth(float depth) // Note that this ranges from [0,1] instead of up to 'far plane distance' since we divide by 'far'
+float near = 1.0; 
+float far = 100.0; 
+float LinearizeDepth(float depth) 
 {
-    float near = 0.1; 
-    float far = 100.0; 
     float z = depth * 2.0 - 1.0; // Back to NDC 
-    return (2.0 * near) / (far + near - z * (far - near));	
+    return (2.0 * near * far) / (far + near - z * (far - near));	
 }
 
 void main()
 {             
-    float depth = LinearizeDepth(gl_FragCoord.z);
+    float depth = LinearizeDepth(gl_FragCoord.z) / far; // divide by far to get depth in range [0,1] for visualization purposes.
     color = vec4(vec3(depth), 1.0f);
 }
\ No newline at end of file