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-rw-r--r--docs/howto/custom-file-storage.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/howto/custom-file-storage.txt b/docs/howto/custom-file-storage.txt
index de44a1d938..881ef70bdf 100644
--- a/docs/howto/custom-file-storage.txt
+++ b/docs/howto/custom-file-storage.txt
@@ -76,7 +76,8 @@ objects. These are:
Called by ``Storage.open()``, this is the actual mechanism the storage class
uses to open the file. This must return a ``File`` object, though in most cases,
you'll want to return some subclass here that implements logic specific to the
-backend storage system.
+backend storage system. The :exc:`FileNotFoundError` exception should be raised
+when a file doesn't exist.
.. method:: _save(name, content)