diff --git a/methodology-development.md b/methodology-development.md
index afc1340..8bd9ccf 100644
--- a/methodology-development.md
+++ b/methodology-development.md
@@ -135,6 +135,7 @@ Context:
 * **API**
   * Requesting - use Python-[requests](https://docs.python-requests.org/en/latest/)
 * **Database / DataWarehouse**
+  * [Pandas cheatsheet](https://pandas.pydata.org/Pandas_Cheat_Sheet.pdf)
   * 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/)