diff --git a/12_nlp_dive.ipynb b/12_nlp_dive.ipynb
index 8b68303..ca30dc0 100644
--- a/12_nlp_dive.ipynb
+++ b/12_nlp_dive.ipynb
@@ -2310,7 +2310,7 @@
     "1. Why does it help to have two hidden states in the LSTM architecture? What is the purpose of each one?\n",
     "1. What are these two states called in an LSTM?\n",
     "1. What is tanh, and how is it related to sigmoid?\n",
-    "1. What is the purpose of this code in `LSTMCell`: `h = torch.stack([h, input], dim=1)`\n",
+    "1. What is the purpose of this code in `LSTMCell`: `h = torch.cat([h, input], dim=1)`\n",
     "1. What does `chunk` do in PyTorch?\n",
     "1. Study the refactored version of `LSTMCell` carefully to ensure you understand how and why it does the same thing as the non-refactored version.\n",
     "1. Why can we use a higher learning rate for `LMModel6`?\n",