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-rw-r--r--docs/ref/forms/fields.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/ref/forms/fields.txt b/docs/ref/forms/fields.txt
index 81b65d04d4..f2cd122526 100644
--- a/docs/ref/forms/fields.txt
+++ b/docs/ref/forms/fields.txt
@@ -375,7 +375,9 @@ For each field, we describe the default widget used if you don't specify
A function that takes one argument and returns a coerced value. Examples
include the built-in ``int``, ``float``, ``bool`` and other types. Defaults
- to an identity function.
+ to an identity function. Note that coercion happens after input
+ validation, so it is possible to coerce to a value not present in
+ ``choices``.
.. attribute:: empty_value