# Add Column to a Data Extension

To capture additional information in an existing data extension, add a column to it.

## Sample SOAP Envelope

```xml
<s:Envelope
  xmlns:s="http://www.w3.org/2003/05/soap-envelope"
  xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing"
  xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
  <s:Header>
    <a:Action s:mustUnderstand="1">Update</a:Action>
    <a:To s:mustUnderstand="1">https://YOUR_SUBDOMAIN.soap.marketingcloudapis.com/Service.asmx</a:To>
    <fueloauth xmlns="http://exacttarget.com">YOUR_ACCESS_TOKEN</fueloauth>
  </s:Header>
  <s:Body
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <UpdateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
      <Options></Options>
      <Objects xsi:type="DataExtension">
        <CustomerKey>b9bdce33-b849-4298-a288-462535f8e145</CustomerKey>
        <Fields>
          <Field>
            <Name>New Field</Name>
            <MaxLength>200</MaxLength>
            <IsRequired>true</IsRequired>
          </Field>
        </Fields>
      </Objects>
    </UpdateRequest>
  </s:Body>
</s:Envelope>
```