diff --git a/src/cellular2x2x2.glsl b/src/cellular2x2x2.glsl
index 904f416..7a31384 100644
--- a/src/cellular2x2x2.glsl
+++ b/src/cellular2x2x2.glsl
@@ -21,13 +21,13 @@ vec4 mod7(vec4 x) {
 }
 
 
-// Permutation polynomial: (34x^2 + x) mod 289
+// Permutation polynomial: (34x^2 + 6x) mod 289
 vec3 permute(vec3 x) {
-  return mod289((34.0 * x + 1.0) * x);
+  return mod289((34.0 * x + 6.0) * x);
 }
 
 vec4 permute(vec4 x) {
-  return mod289((34.0 * x + 1.0) * x);
+  return mod289((34.0 * x + 6.0) * x);
 }
 
 // Cellular noise, returning F1 and F2 in a vec2.