Update 3.x upgrade guide.md (#2436)

rjsf-team · Jun 27, 2021 · 530ec1f · 530ec1f
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@@ -10,6 +10,10 @@ Dropped support for Node 8, 9, 10. Minimum supported version of Node.js is now 1
 
 `MultiSchemaField`'s `options` interface is different. Before, an option could include a `$ref`. Now, any option with a reference will be resolved/dereferenced when given as props for `MultiSchemaField`.
 
+### Help field IDs
+
+IDs for [Help fields](https://react-jsonschema-form.readthedocs.io/en/latest/api-reference/uiSchema/#help) are now suffixed by `__help` so that the IDs are unique. Previously, their IDs would be the same as the fields that they were describing.
+
 ### Bring your own polyfills
 
 core-js@2 has been removed from @rjsf/core. See more about [the rationale here](https://github.com/rjsf-team/react-jsonschema-form/pull/2211#issue-563700810).