diff --git a/errata/README.md b/errata/README.md
index 0b600ccd..bdb5e66c 100644
--- a/errata/README.md
+++ b/errata/README.md
@@ -9,3 +9,8 @@
 - 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.
+
+
+## Chapter 13
+
+- pg. 469: Instead of `tf.keras.activations.tanh(z)` it should be `tf.keras.activations.relu(z)`.