diff --git a/tox_poetry_installer/exceptions.py b/tox_poetry_installer/exceptions.py
index 4ecd9b8..86102fd 100644
--- a/tox_poetry_installer/exceptions.py
+++ b/tox_poetry_installer/exceptions.py
@@ -8,6 +8,7 @@ All exceptions should inherit from the common base exception :exc:`ToxPoetryInst
    +-- LockedDepVersionConflictError
    +-- LockedDepNotFoundError
    +-- ExtraNotFoundError
+   +-- LockedDepsRequiredError
 
 """