diff --git a/tools_numpy.ipynb b/tools_numpy.ipynb
index 5ec032d..ed2d81b 100644
--- a/tools_numpy.ipynb
+++ b/tools_numpy.ipynb
@@ -459,7 +459,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "NumPy first creates three `ndarrays` (one per dimension), each of shape `(3, 2, 10)`. Each array has values equal to the coordinate along a specific axis. For example, all elements in the `z` array are equal to their z-coordinate:\n",
+    "NumPy first creates three `ndarrays` (one per dimension), each of shape `(2, 10)`. Each array has values equal to the coordinate along a specific axis. For example, all elements in the `z` array are equal to their z-coordinate:\n",
     "\n",
     "    [[[ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]\n",
     "      [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]]\n",