diff --git a/Assets/automata/wireworld.shader b/Assets/automata/wireworld.shader
index a75676b..7141105 100644
--- a/Assets/automata/wireworld.shader
+++ b/Assets/automata/wireworld.shader
@@ -82,8 +82,8 @@
 				const float d = 1.0/resolution;
 
 				float t = tex2D(_LastFrame, 0).r;
-				if (i.uv.x < 0.01 && i.uv.y < 0.01) {
-					if (t > 0.9){
+				if (i.uv.x < d && i.uv.y < d) {
+					if (t > 0.9) {
 						return float4(0, 0, 0, 1);
 					}
 					t = t + 0.02;