diff --git a/doc/en/usage.rst b/doc/en/usage.rst
index acf736f21..ad7e2cdab 100644
--- a/doc/en/usage.rst
+++ b/doc/en/usage.rst
@@ -33,6 +33,8 @@ Running ``pytest`` can result in six different exit codes:
 :Exit code 4: pytest command line usage error
 :Exit code 5: No tests were collected
 
+They are repressended by the :class:`_pytest.main.ExitCode` enum.
+
 Getting help on version, option names, environment variables
 --------------------------------------------------------------