Updated user documentation for the Readonly behaviour

docs/components/forms.rst

@@ -259,6 +259,7 @@ The Behavior tab helps marketers to improve the experience for the visitor compl
 - **Show when value exists**: if Mautic knows the Contact and they're tracked, when a value exists for a field Mautic hides the field when this setting is No. This prevents the Contact answering the same question multiple times. You may want to display the field even if it's already known when you want to ensure you have the most up to date information about the Contact.
 - **Show after X submissions**: this allows the marketer to show certain fields only when the Contact has submitted the Form a specified number of times. Enter a value between ``1`` and ``200``.  When left undefined, the field shows every time the Contact views the Form. The goal is to minimize the number of fields shown to the Contact, so it's recommended to hide fields if it's not necessary to verify the values.
 - **Auto-fill data**: this allows you to pre-populate Contact data with known Contacts where the information exists in the Contact profile. Auto-fill works with Mautic Landing Pages, and data won't pre-populate when placing the Form anywhere else. Even if you're hiding this field, you may wish to turn on auto-fill to ensure saving of the information with the Form submission.
+- **Read only**: activate this setting to lock auto-filled fields with existing Contact information, preventing any edits by Contacts. This ensures that the data submitted with the Form remains accurate and consistent, especially for critical details like Email addresses. Enable this option together with Auto-fill data to stop Contacts from changing essential information during Form submission.
 
 Field order
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