diff --git a/README.md b/README.md
index fdd17ed..7c5d486 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,7 @@ Path('.').absolute()
   * [Divide year into 26 fortnights labelled A-Z](https://futureofcoding.org/episodes/044#19)
   * Avoid [dark patterns](https://darkpatterns.org/types-of-dark-pattern.html)
 * Database / DataWarehouse
+  * PostgreSQL ([datetime functs](https://www.postgresql.org/docs/9.1/functions-datetime.html))
   * Consider SQL (but [don't use `select *`](https://tanelpoder.com/posts/reasons-why-select-star-is-bad-for-sql-performance/))
   * Be aware of [feature casualties of large databases](https://web.dev/streams/)
   * [Data Science - Hierarchy of Needs](https://hackernoon.com/the-ai-hierarchy-of-needs-18f111fcc007)