diff --git a/13_convolutions.ipynb b/13_convolutions.ipynb
index 53803eb..f7f6006 100644
--- a/13_convolutions.ipynb
+++ b/13_convolutions.ipynb
@@ -1281,7 +1281,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "There's a top edge at cell 5,7. Let's repeat our calculation there:"
+    "There's a top edge at cell 5,8. Let's repeat our calculation there:"
    ]
   },
   {