diff --git a/specs/email-sending.openapi.yml b/specs/email-sending.openapi.yml
index db3ff35..a9d7c7d 100644
--- a/specs/email-sending.openapi.yml
+++ b/specs/email-sending.openapi.yml
@@ -1514,16 +1514,34 @@ components:
           type: boolean
         compliance_status:
           type: string
+          description: |
+            Indicates the compliance verification status of the sending domain.
+            The domain must reach `compliant` status before you can send emails
+            in production.
+
+            - `demo` - A demo domain provided by Mailtrap. Can only send emails to the account owner.
+            - `exhausted` - A demo domain that has used up its sending allowance. Cannot send emails.
+            - `unverified_dns` - Domain DNS records have not been verified yet. Open your domain on the [Sending Domains](https://mailtrap.io/sending/domains) page and follow the [Sending Domain Setup](https://docs.mailtrap.io/email-api-smtp/setup/sending-domain) guide.
+            - `missing_company_info` - Account is missing required company information. Go to [Company Information](https://mailtrap.io/account-management?current_tab=company_information) and fill in the required details.
+            - `initial` - Domain is verified and undergoing automatic compliance review. No action needed — typically completes within 2 minutes.
+            - `pending` - Automatic review required additional information. Open your domain on the [Sending Domains](https://mailtrap.io/sending/domains) page and fill in the compliance questionnaire.
+            - `pending_cc` - Compliance questionnaire was submitted but credit card identity verification is still needed. Open your domain on the [Sending Domains](https://mailtrap.io/sending/domains) page and enter card details. The charged amount is refunded immediately and the card is not stored.
+            - `under_review` - Compliance questionnaire submitted and manual review is in progress. No action needed — this can take up to one business day.
+            - `non_compliant` - Domain did not pass compliance checks. Sending is not allowed. Contact [Mailtrap Support](mailto:support@mailtrap.io) for details and next steps.
+            - `compliant` - Domain has passed all compliance checks and is ready to send emails.
+            - `suspended` - Domain sending has been suspended. Contact [Mailtrap Support](mailto:support@mailtrap.io) to resolve the issue.
           enum:
             - initial
             - unverified_dns
             - demo
             - missing_company_info
             - pending
+            - pending_cc
             - under_review
+            - compliant
             - non_compliant
             - suspended
-            - compliant
+            - exhausted
         dns_verified:
           type: boolean
         dns_verified_at: