diff --git a/15_arch_details.ipynb b/15_arch_details.ipynb
index 90caabc..ac87199 100644
--- a/15_arch_details.ipynb
+++ b/15_arch_details.ipynb
@@ -761,7 +761,7 @@
     "1. What is `model_meta`? Try printing it to see what's inside.\n",
     "1. Read the source code for `create_head` and make sure you understand what each line does.\n",
     "1. Look at the output of `create_head` and make sure you understand why each layer is there, and how the `create_head` source created it.\n",
-    "1. Figure out how to change the dropout, layer size, and number of layers created by `create_cnn`, and see if you can find values that result in better accuracy from the pet recognizer.\n",
+    "1. Figure out how to change the dropout, layer size, and number of layers created by `cnn_learner`, and see if you can find values that result in better accuracy from the pet recognizer.\n",
     "1. What does `AdaptiveConcatPool2d` do?\n",
     "1. What is \"nearest neighbor interpolation\"? How can it be used to upsample convolutional activations?\n",
     "1. What is a \"transposed convolution\"? What is another name for it?\n",