diff --git a/Data/Sys/Shaders/Anaglyph/grayscale2.glsl b/Data/Sys/Shaders/Anaglyph/grayscale2.glsl
index 1746396fd8..14c5068704 100644
--- a/Data/Sys/Shaders/Anaglyph/grayscale2.glsl
+++ b/Data/Sys/Shaders/Anaglyph/grayscale2.glsl
@@ -1,5 +1,5 @@
 // Anaglyph Red-Cyan luma grayscale shader
-// Info: http://www.oreillynet.com/cs/user/view/cs_msg/8691
+// Info: https://web.archive.org/web/20040101053504/http://www.oreillynet.com:80/cs/user/view/cs_msg/8691
 
 void main()
 {
diff --git a/Data/Sys/Shaders/grayscale2.glsl b/Data/Sys/Shaders/grayscale2.glsl
index 98cb1f8838..5e166699ea 100644
--- a/Data/Sys/Shaders/grayscale2.glsl
+++ b/Data/Sys/Shaders/grayscale2.glsl
@@ -1,7 +1,7 @@
 void main()
 {
 	float4 c0 = Sample();
-	// Info: http://www.oreillynet.com/cs/user/view/cs_msg/8691
+	// Info: https://web.archive.org/web/20040101053504/http://www.oreillynet.com:80/cs/user/view/cs_msg/8691
 	float avg = (0.222 * c0.r) + (0.707 * c0.g) + (0.071 * c0.b);
 	SetOutput(float4(avg, avg, avg, c0.a));
 }