diff --git a/17_foundations.ipynb b/17_foundations.ipynb
index 016ec4e..4597504 100644
--- a/17_foundations.ipynb
+++ b/17_foundations.ipynb
@@ -1937,7 +1937,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Once we have have defined those functions, we can use them to write the backward pass. Since each gradient is automatically populated in the right tensor, we don't need to store the results of those `_grad` functions anywhere—we just need to execute them in the reverse order of the forward pass, to make sure that in each function `out.g` exists:"
+    "Once we have defined those functions, we can use them to write the backward pass. Since each gradient is automatically populated in the right tensor, we don't need to store the results of those `_grad` functions anywhere—we just need to execute them in the reverse order of the forward pass, to make sure that in each function `out.g` exists:"
    ]
   },
   {