diff --git a/modules/hex_wave.frag b/modules/hex_wave.frag
index 105921f..55f7d96 100644
--- a/modules/hex_wave.frag
+++ b/modules/hex_wave.frag
@@ -70,7 +70,7 @@ void main() {
     a += 0.12 * wf;
 
     // Rainbow shimmer on hex edges when wave passes
-    float edgeWidth = 2.0;
+    float edgeWidth = 5.0;
     float edgeFactor = smoothstep(-edgeWidth, 0.0, d);  // 0 at interior, 1 at edge
     if (wf > 0.01 && edgeFactor > 0.0) {
         // Angle around hex center → hue