diff --git a/errata/README.md b/errata/README.md
index b31fc74a..efbf4b6f 100644
--- a/errata/README.md
+++ b/errata/README.md
@@ -16,7 +16,9 @@
 
 ## Chapter 3
 
-- pg 56: The comment about the `n_iter` method can be ignored as it does not apply to recent scikit-learn versions (0.21 and newer)
+- pg. 56: The comment about the `n_iter` method can be ignored as it does not apply to recent scikit-learn versions (0.21 and newer)
+
+- pg. 84: It says "XOR gate using the `logical_or` function from NumPy, " near the bottom, but it should be `logical_xor` instead of `logical_or`
 
 ## Chapter 5