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@@ -163,6 +163,13 @@ Specifically it uses:
For complete details consult the `specification`_.
+Limitations
+-----------
+
+Fernet is ideal for encrypting data that easily fits in memory. As a design
+feature it does not expose unauthenticated bytes. Unfortunately, this makes it
+generally unsuitable for very large files at this time.
+
.. _`Fernet`: https://github.com/fernet/spec/
.. _`specification`: https://github.com/fernet/spec/blob/master/Spec.md