diff --git a/linux_os/guide/services/mail/package_postfix_installed/rule.yml b/linux_os/guide/services/mail/package_postfix_installed/rule.yml
index a2b8325d231..6ba5bd00e61 100644
--- a/linux_os/guide/services/mail/package_postfix_installed/rule.yml
+++ b/linux_os/guide/services/mail/package_postfix_installed/rule.yml
@@ -17,6 +17,7 @@ identifiers:
     cce@rhel9: CCE-85984-3
 
 references:
+    disa: CCI-000139
     srg: SRG-OS-000046-GPOS-00022
     stigid@rhel8: RHEL-08-030030