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errata/README.md

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 - pg 42: It should be "eta=0.01" instead of "eta=0.1" in the sentence
 
 > So, let's choose two different learning rates, eta = 0.1 and eta = 0.0001, to start with and plot the cost functions versus the number of epochs to see how well the Adaline implementation learns from the training data.
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+## Chapter 13
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+- pg. 469: Instead of `tf.keras.activations.tanh(z)` it should be `tf.keras.activations.relu(z)`.