From c4a4d254de04c3628c4a57ef514d3fc324d4f26d Mon Sep 17 00:00:00 2001
From: Antoine Lamirault <lamiraultantoine@gmail.com>
Date: Wed, 15 Feb 2023 21:50:30 +0100
Subject: [PATCH] Add Form is_empty_callback option

---
 reference/forms/types/form.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/reference/forms/types/form.rst b/reference/forms/types/form.rst
index b2314fe8bd2..945bfafc365 100644
--- a/reference/forms/types/form.rst
+++ b/reference/forms/types/form.rst
@@ -64,6 +64,13 @@ The actual default value of this option depends on other field options:
 * If ``data_class`` is not set and ``compound`` is ``false``, then ``''``
   (empty string).
 
+``is_empty_callback``
+~~~~~~~~~~~~~~~~~~~~~
+
+**type**: ``callable`` **default**: ``null``
+
+This callable takes form data and returns whether value is considered empty.
+
 .. include:: /reference/forms/types/options/empty_data_description.rst.inc
 
 .. _reference-form-option-error-bubbling: