+
+``wizard.user.quota``
+---------------------
+
+Plugin for :func:`wizard.user.quota`. Wizard has safeguards for
+avoiding exceeding user quotas when an automated upgrade is being
+performed. Unfortunately, methods for enforcing quotas are frequently
+highly system dependent. Use this hook to implement quota usage and
+limit reporting. Plugin should be a function that takes a single
+required argument ``dir``, which is the directory to determine the quota
+for, and return a tuple ``(quota usage, quota limit)`` or ``(0, None)``
+if it could not determine quota.