Document the other consequence of losing your key
diff --git a/docs/contributing.rst b/docs/contributing.rst
index cb9c728..036043f 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -244,7 +244,8 @@
docs: commands succeeded
congratulations :)
-The HTML documentation index can now be found at ``docs/_build/html/index.html``
+The HTML documentation index can now be found at
+``docs/_build/html/index.html``.
.. _`GitHub`: https://github.com/pyca/cryptography
diff --git a/docs/fernet.rst b/docs/fernet.rst
index 241bf1e..3f0cdde 100644
--- a/docs/fernet.rst
+++ b/docs/fernet.rst
@@ -30,7 +30,9 @@
Generates a fresh fernet key. Keep this some place safe! If you lose it
you'll no longer be able to decrypt messages; if anyone else gains
- access to it, they'll be able to decrypt all of your messages.
+ access to it, they'll be able to decrypt all of your messages, and
+ they'll also be able forge arbitrary messages which will be
+ authenticated and decrypted.
.. method:: encrypt(plaintext)