diff --git a/RELEASING.md b/CONTRIBUTING.md
similarity index 71%
rename from RELEASING.md
rename to CONTRIBUTING.md
index 9e50c1063..7c435b5ac 100644
--- a/RELEASING.md
+++ b/CONTRIBUTING.md
@@ -1,4 +1,13 @@
-# Releasing
+## Running tests
+
+To run tests, you need Docker which starts PostgreSQL and MySQL servers:
+
+```shell
+cd internal/dbtest
+./test.sh
+```
+
+## Releasing
 
 1. Run `release.sh` script which updates versions in go.mod files and pushes a new branch to GitHub: