diff --git a/errata/README.md b/errata/README.md
index 25db47a8..da9d3d4e 100644
--- a/errata/README.md
+++ b/errata/README.md
@@ -8,10 +8,13 @@
 
 - pg 25: the superscripts (i) in $ \Delta w_{j}=\left(1^{(i)}-(-1)^{(i)}\right) 2^{(i)}=(2) 2^{(i)}=4 $ were initially used for illustration purposes in previous editions but are not necessary and could/should be removed
 
-- pg 42: It should be "eta=0.01" instead of "eta=0.1" in the sentence
+- 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 5
+
+- pg. 162. In `S_i = \sum_{x in D_i} (x - m_i) (x - m_i)^{\top}`, the transpose should be on the first row vector, i.e., `S_i = \sum_{x in D_i} (x - m_i)^{\top} (x - m_i)`.
 
 ## Chapter 13