diff --git a/reference/constraints/Iban.rst b/reference/constraints/Iban.rst
index 3cf800200e2..fac17f82739 100644
--- a/reference/constraints/Iban.rst
+++ b/reference/constraints/Iban.rst
@@ -85,6 +85,14 @@ will contain an International Bank Account Number.
.. include:: /reference/constraints/_empty-values-are-valid.rst.inc
+.. note::
+
+ The IBAN validator accepts various human-readable formats, including different
+ whitespace types (e.g., spaces, non-breaking spaces). This flexibility may
+ cause issues when storing IBANs or integrating with APIs expecting a strict
+ format. Consider normalizing IBANs (e.g., removing whitespace) before storage
+ or processing to ensure compatibility.
+
Options
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