diff --git a/BTCPayServer.Tests/README.md b/BTCPayServer.Tests/README.md
index a9bb1a930..20df8e227 100644
--- a/BTCPayServer.Tests/README.md
+++ b/BTCPayServer.Tests/README.md
@@ -35,6 +35,8 @@ You can run the tests inside a container by running
 docker-compose run --rm tests
 ```
 
+You can run tests on `MySql` database instead of `Postgres` by setting environnement variable `TESTS_DB` equals to `MySql`.
+
 ## How to manually test payments
 
 ### Using the test bitcoin-cli