diff --git a/src/Endpoints/CustomHostnames.php b/src/Endpoints/CustomHostnames.php
index 7a0d2de3..0e6b5a14 100644
--- a/src/Endpoints/CustomHostnames.php
+++ b/src/Endpoints/CustomHostnames.php
@@ -74,6 +74,10 @@ public function addHostname(
             $options['ssl']['custom_certificate'] = $customSsl['certificate'];
         }
 
+        if (!empty($customSsl['certificate_authority'])) {
+            $options['ssl']['custom_certificate'] = $customSsl['certificate_authority'];
+        }
+
         $zone = $this->adapter->post('zones/'.$zoneID.'/custom_hostnames', $options);
         $this->body = json_decode($zone->getBody());
         return $this->body->result;
@@ -199,6 +203,10 @@ public function updateHostname(
             $query['custom_certificate'] = $customSsl['certificate'];
         }
 
+        if (!empty($customSsl['certificate_authority'])) {
+            $query['custom_certificate'] = $customSsl['certificate_authority'];
+        }
+
         if (!empty($query)) {
             $options = [
                 'ssl' => $query