diff --git a/README.md b/README.md
index 8759bd908..7c480145f 100644
--- a/README.md
+++ b/README.md
@@ -53,10 +53,12 @@ CREATE DATABASE jubilant_test WITH OWNER=jubilant ENCODING=UTF8;
 \c jubilant_test;
 CREATE EXTENSION IF NOT EXISTS CITEXT;
 CREATE EXTENSION IF NOT EXISTS pg_trgm;
+CREATE EXTENSION IF NOT EXISTS pgrowlocks;
 CREATE DATABASE jubilant WITH OWNER=jubilant ENCODING=UTF8;
 \c jubilant;
 CREATE EXTENSION IF NOT EXISTS CITEXT;
 CREATE EXTENSION IF NOT EXISTS pg_trgm;
+CREATE EXTENSION IF NOT EXISTS pgrowlocks;
 ```
 
 If you are using Docker, you may find it easiest to run the database in Docker by running `make run-docker-postgres`.