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title: Documents and Nodes | Developer Documentation
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##### FAQ

1. [What is the default `chunk_size` of a Node object?](#1-what-is-the-default-chunk_size-of-a-node-object)
2. [How to add information like name, url in a `Document` object?](#2-how-to-add-information-like-name-url-in-a-document-object)
3. [How to update existing document in an Index?](#3-how-to-update-existing-document-in-an-index)

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##### 1. What is the default `chunk_size` of a Node object?

It’s 1024 by default. If you want to customize the `chunk_size`, You can follow [Customizing Node](/python/framework/module_guides/loading/node_parsers#customization/index.md)

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##### 2. How to add information like name, url in a `Document` object?

You can customize the Document object and add extra info in the form of metadata. To know more on this follow [Customize Document](/python/framework/module_guides/loading/documents_and_nodes/usage_documents#customizing-documents/index.md).

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##### 3. How to update existing document in an Index?

You can update/delete existing document in an Index with the help of `doc_id`. You can add new document to an existing Index too. To know more check [Document Management](/python/framework/module_guides/indexing/document_management/index.md)

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