diff --git a/src/Symfony/Component/Mailer/Bridge/Infobip/README.md b/src/Symfony/Component/Mailer/Bridge/Infobip/README.md
index c86458c3991f..64e445b36106 100644
--- a/src/Symfony/Component/Mailer/Bridge/Infobip/README.md
+++ b/src/Symfony/Component/Mailer/Bridge/Infobip/README.md
@@ -12,8 +12,25 @@ MAILER_DSN=infobip+api://KEY@BASE_URL
MAILER_DSN=infobip+smtp://KEY@default
```
+Custom Headers
+--------------
+
+This transport supports the following custom headers:
+
+| Header | Type | Description |
+|--------------------------------|---------|-----------------------------------------------------------------------------------------|
+| `X-Infobip-IntermediateReport` | boolean | The real-time Intermediate delivery report that will be sent on your callback server. |
+| `X-Infobip-NotifyUrl` | string | The URL on your callback server on which the Delivery report will be sent. |
+| `X-Infobip-NotifyContentType` | string | Preferred Delivery report content type. Can be application/json or application/xml. |
+| `X-Infobip-MessageId` | string | The ID that uniquely identifies the message sent to a recipient. |
+| `X-Infobip-Track` | boolean | Enable or disable open and click tracking. |
+| `X-Infobip-TrackingUrl` | string | The URL on your callback server on which the open and click notifications will be sent. |
+| `X-Infobip-TrackClicks` | boolean | Enable or disable track click feature.. |
+| `X-Infobip-TrackOpens` | boolean | Enable or disable open click feature. |
+
Resources
---------
+
* [Infobip Api Docs](https://www.infobip.com/docs/api#channels/email)
* [Contributing](https://symfony.com/doc/current/contributing/index.html)
* [Report issues](https://github.com/symfony/symfony/issues) and
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