diff --git a/webgpu/lessons/webgpu-vertex-buffers.md b/webgpu/lessons/webgpu-vertex-buffers.md
index 1f8420bc..d06366f7 100644
--- a/webgpu/lessons/webgpu-vertex-buffers.md
+++ b/webgpu/lessons/webgpu-vertex-buffers.md
@@ -928,12 +928,12 @@ function createCircleVertices({
 +  let ndx = 0;
 +
 +  // 1st tri  2nd tri  3rd tri  4th tri
-+  // 0 1 2    2 1 3    4 5 6    6 5 7
++  // 0 1 2    2 1 3    2 3 4    4 3 5
 +  //
-+  // 0--2        2     4--6        6  .....
++  // 0--2        2     2--4        4  .....
 +  // | /        /|     | /        /|
 +  // |/        / |     |/        / |
-+  // 1        1--3     5        5--7  .....
++  // 1        1--3     3        3--5  .....
 +  for (let i = 0; i < numSubdivisions; ++i) {
 +    const ndxOffset = i * 2;
 +
diff --git a/webgpu/webgpu-vertex-buffers-index-buffer.html b/webgpu/webgpu-vertex-buffers-index-buffer.html
index baf2384f..6928cfdf 100644
--- a/webgpu/webgpu-vertex-buffers-index-buffer.html
+++ b/webgpu/webgpu-vertex-buffers-index-buffer.html
@@ -83,12 +83,12 @@
   let ndx = 0;
 
   // 1st tri  2nd tri  3rd tri  4th tri
-  // 0 1 2    2 1 3    4 5 6    6 5 7
+  // 0 1 2    2 1 3    2 3 4    4 3 5
   //
-  // 0--2        2     4--6        6  .....
+  // 0--2        2     2--4        4  .....
   // | /        /|     | /        /|
   // |/        / |     |/        / |
-  // 1        1--3     5        5--7  .....
+  // 1        1--3     3        3--5  .....
   for (let i = 0; i < numSubdivisions; ++i) {
     const ndxOffset = i * 2;