diff --git a/doc/en/how-to/usage.rst b/doc/en/how-to/usage.rst
index ce8247b44..f9b38b19e 100644
--- a/doc/en/how-to/usage.rst
+++ b/doc/en/how-to/usage.rst
@@ -184,6 +184,7 @@ You can specify additional plugins to ``pytest.main``:
 
     # content of myinvoke.py
     import pytest
+    import sys
 
 
     class MyPlugin: