diff --git a/src/Api/Domain.php b/src/Api/Domain.php
index ba73fe5..0c24c3b 100644
--- a/src/Api/Domain.php
+++ b/src/Api/Domain.php
@@ -84,10 +84,11 @@ class Domain extends HttpApi
      * @param bool     $wildcard           domain will accept email for subdomains
      * @param bool     $forceDkimAuthority force DKIM authority
      * @param string[] $ips                an array of ips to be assigned to the domain
+     * @param ?string  $pool_id            pool id to assign to the domain
      *
      * @return CreateResponse|array|ResponseInterface
      */
-    public function create(string $domain, string $smtpPass = null, string $spamAction = null, bool $wildcard = null, bool $forceDkimAuthority = null, ?array $ips = null)
+    public function create(string $domain, string $smtpPass = null, string $spamAction = null, bool $wildcard = null, bool $forceDkimAuthority = null, ?array $ips = null, ?string $pool_id = null)
     {
         Assert::stringNotEmpty($domain);
 
@@ -125,6 +126,12 @@ class Domain extends HttpApi
             $params['ips'] = join(',', $ips);
         }
 
+        if (null !== $pool_id) {
+            Assert::stringNotEmpty($pool_id);
+
+            $params['pool_id'] = $pool_id;
+        }
+
         $response = $this->httpPost('/v3/domains', $params);
 
         return $this->hydrateResponse($response, CreateResponse::class);
diff --git a/tests/Api/DomainTest.php b/tests/Api/DomainTest.php
index b81c168..4beaa18 100644
--- a/tests/Api/DomainTest.php
+++ b/tests/Api/DomainTest.php
@@ -103,6 +103,21 @@ JSON
         $api->create('example.com', 'foo');
     }
 
+    public function testCreateWithPoolId()
+    {
+        $this->setRequestMethod('POST');
+        $this->setRequestUri('/v3/domains');
+        $this->setRequestBody([
+            'name' => 'example.com',
+            'smtp_password' => 'foo',
+            'pool_id' => '123',
+        ]);
+        $this->setHydrateClass(CreateResponse::class);
+
+        $api = $this->getApiInstance();
+        $api->create('example.com', 'foo', null, null, null, null, '123');
+    }
+
     public function testCreateWithPasswordSpamAction()
     {
         $this->setRequestMethod('POST');