diff --git a/misc/index.html b/misc/index.html
index 6c81b34..1682b56 100644
--- a/misc/index.html
+++ b/misc/index.html
@@ -39,7 +39,7 @@ <h4>Downsample options</h4>
                 <div>
                     <label for="customFilterCode">Custom filter code</label>
                     <div>
-                        <textarea id="customFilterCode" type="text" cols="120" rows="1">fn spd_reduce_4(v0: vec4<f32>, v1: vec4<f32>, v2: vec4<f32>, v3: vec4<f32>) -> vec4<f32> { return v0; }</textarea>
+                        <textarea id="customFilterCode" type="text" cols="120" rows="1">fn spd_reduce_4(v0: vec4<SPDFloat>, v1: vec4<SPDFloat>, v2: vec4<SPDFloat>, v3: vec4<SPDFloat>) -> vec4<SPDFloat> { return v0; }</textarea>
                     </div>
                 </div>
                 <div>