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-rw-r--r--webob/response.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/webob/response.py b/webob/response.py
index 9a606de..94de6f2 100644
--- a/webob/response.py
+++ b/webob/response.py
@@ -1026,6 +1026,9 @@ class Response(object):
local time are not supported. Timezone aware ``datetime.datetime``
objects are converted to UTC.
+ ``expires`` should be set in the future, if it is set in the past a
+ RuntimeWarning will be issued.
+
This argument will be removed in future
versions of WebOb (version 1.9).