diff --git a/docs/tutorial.rst b/docs/tutorial.rst
--- a/docs/tutorial.rst
+++ b/docs/tutorial.rst
@@ -156,6 +156,8 @@
    takes a complete request response and returns the index ('foo' above) of the
    next page.
 
+Note: You also need add your lister in the main conftest.py (swh/lister/core/tests/conftest.py)
+
 So those are all the basic requirements. There are, of course, a few other
 little bits and pieces (covered for now in the code's docstring comments), but
 for the most part that's it. It sounds like a lot of information to absorb and