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-rw-r--r--docs/topics/signing.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/topics/signing.txt b/docs/topics/signing.txt
index 480af18db7..75f066837c 100644
--- a/docs/topics/signing.txt
+++ b/docs/topics/signing.txt
@@ -74,8 +74,10 @@ generate signatures. You can use a different secret by passing it to the
.. class:: Signer(key=None, sep=':', salt=None)
- Returns a signer which uses ``key`` to generate signatures and ``sep``
- to separate values.
+ Returns a signer which uses ``key`` to generate signatures and ``sep`` to
+ separate values. ``sep`` cannot be in the `URL safe base64 alphabet
+ <http://tools.ietf.org/html/rfc4648#section-5>`_. This alphabet contains
+ alphanumeric characters, hyphens, and underscores.
Using the salt argument
-----------------------