diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 388fab7..dec7554 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -13,17 +13,28 @@ Actually, the makefile only support Podman. I don't have tested with docker yet.
 
 The Makefile accept the following options:
 
-- db_engin_version: The name of the container to use. Either MYSQL or MariaDB. Use ':' as a separator. Do not use short version, like mysql:8 for instance. Our tests expect a full version to filter tests based on released version. For instance: when: db_version is version ('8.0.22', '>').
+- db_engine_version: The name of the container to use. Either MYSQL or MariaDB. Use ':' as a separator. Do not use short version, like mysql:8 for instance. Our tests expect a full version to filter tests based on released version. For instance: when: db_version is version ('8.0.22', '>').
 - connector: The name of the python package of the connector along with its version number. Use '==' as a separator.
 - python: The python version to use in the controller.
 - target : If omitted, all test targets will run. But you can limit the tests to a single target to speed up your tests.
 
-Exemples:
+Examples:
 
 ```sh
-# Run all tests
+# Run all targets
 make db_engine_version="mysql:5.7.40" connector="pymysql==0.7.10" python="3.8"
 
 # A single target
 make db_engine_version="mysql:5.7.40" connector="pymysql==0.7.10" python="3.8" target="test_mysql_db"
 ```
+
+
+### Run all tests
+
+GitHub Action offer a test matrix that run every combination of Python, MySQL, MariaDB and Connector against each other. To reproduce this, this repo provides a script called *run_all_tests.py*.
+
+Examples:
+
+```sh
+python run_all_tests.py
+```
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