diff --git a/12_nlp_dive.ipynb b/12_nlp_dive.ipynb
index 070cc83..95a9561 100644
--- a/12_nlp_dive.ipynb
+++ b/12_nlp_dive.ipynb
@@ -1568,7 +1568,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In this picture, our input $x_{t}$ enters on the bottom with the previous hidden state ($h_{t-1}$) and cell state ($x_{t-1}$). The four orange boxes represent four layers with the activation being either sigmoid (for $\\sigma$) or tanh. tanh is just a sigmoid rescaled to the range -1 to 1. Its mathematical expression can be written like this:\n",
+    "In this picture, our input $x_{t}$ enters on the bottom with the previous hidden state ($h_{t-1}$) and cell state ($c_{t-1}$). The four orange boxes represent four layers with the activation being either sigmoid (for $\\sigma$) or tanh. tanh is just a sigmoid rescaled to the range -1 to 1. Its mathematical expression can be written like this:\n",
     "\n",
     "$$\\tanh(x) = \\frac{e^{x} + e^{-x}}{e^{x}-e^{-x}} = 2 \\sigma(2x) - 1$$\n",
     "\n",