diff --git a/README.md b/README.md
index e7d5aa5..aeb8a87 100644
--- a/README.md
+++ b/README.md
@@ -173,5 +173,6 @@ has been passionate about computer science since he was a 13-year-old, his first
 #### Errata
 * Page 82 (Dropping databases, first paragraph): **to drop a table** _should be_ **to drop a database**
 * Page 581 (Section 5, heading): **The PostegreSQL System** _should be_ **The PostgreSQL System**
+* Page 114 (Using the IN/NOT IN condition, last paragraph): **the values `pk=2` and `pk=4`** _should be_ **the single value `pk=11`**; **that have `pk=2` or `pk=4`** _should be_ **that have `category=11`**.