diff --git a/Documentation/Exceptions/1480765571.rst b/Documentation/Exceptions/1480765571.rst
index a1fb4a74..18ccde3c 100644
--- a/Documentation/Exceptions/1480765571.rst
+++ b/Documentation/Exceptions/1480765571.rst
@@ -47,3 +47,24 @@ but forget the prefix `FILE:`:
         'FILE:EXT:my_extension/Configuration/FlexForms/MyFlexForm.xml',
         'myextension_textpic'
     );
+
+Mismatching name of the FlexForm file (TYPO3 14.3.5)
+====================================================
+
+This exception is thrown if no file exists at the configured path. The file name
+is case-sensitive and must match exactly, in this example
+:file:`flexform_ds_plugin.xml`:
+
+..  code-block:: php
+    :caption: EXT:my_extension/Configuration/TCA/Overrides/tt_content.php
+    :linenos:
+    :emphasize-lines: 6
+
+    use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
+
+    $extensionKey = 'my_extension';
+    ExtensionManagementUtility::addPiFlexFormValue(
+        '*',
+        'FILE:EXT:' . $extensionKey . '/Configuration/FlexForms/flexform_ds_plugin.xml',
+        $pluginSignature,
+    );