diff --git a/apns2/payload.py b/apns2/payload.py
index 8dbe595..52cdd52 100644
--- a/apns2/payload.py
+++ b/apns2/payload.py
@@ -9,6 +9,9 @@ def __init__(
             title: Optional[str] = None,
             title_localized_key: Optional[str] = None,
             title_localized_args: Optional[List[str]] = None,
+            subtitle: Optional[str] = None,
+            subtitle_localized_key: Optional[str] = None,
+            subtitle_localized_args: Optional[List[str]] = None,
             body: Optional[str] = None,
             body_localized_key: Optional[str] = None,
             body_localized_args: Optional[List[str]] = None,
@@ -19,6 +22,9 @@ def __init__(
         self.title = title
         self.title_localized_key = title_localized_key
         self.title_localized_args = title_localized_args
+        self.subtitle = subtitle
+        self.subtitle_localized_key = subtitle_localized_key
+        self.subtitle_localized_args = subtitle_localized_args
         self.body = body
         self.body_localized_key = body_localized_key
         self.body_localized_args = body_localized_args
@@ -36,6 +42,13 @@ def dict(self) -> Dict[str, Any]:
         if self.title_localized_args:
             result['title-loc-args'] = self.title_localized_args
 
+        if self.subtitle:
+            result['subtitle'] = self.subtitle
+        if self.subtitle_localized_key:
+            result['subtitle-loc-key'] = self.subtitle_localized_key
+        if self.subtitle_localized_args:
+            result['subtitle-loc-args'] = self.subtitle_localized_args
+
         if self.body:
             result['body'] = self.body
         if self.body_localized_key:
diff --git a/test/test_payload.py b/test/test_payload.py
index d768c5b..c56b742 100644
--- a/test/test_payload.py
+++ b/test/test_payload.py
@@ -7,8 +7,11 @@
 def payload_alert():
     return PayloadAlert(
         title='title',
-        title_localized_key='loc_k',
-        title_localized_args=['loc_a'],
+        title_localized_key='title_loc_k',
+        title_localized_args=['title_loc_a'],
+        subtitle='subtitle',
+        subtitle_localized_key='subtitle_loc_k',
+        subtitle_localized_args=['subtitle_loc_a'],
         body='body',
         body_localized_key='body_loc_k',
         body_localized_args=['body_loc_a'],
@@ -21,8 +24,11 @@ def payload_alert():
 def test_payload_alert(payload_alert):
     assert payload_alert.dict() == {
         'title': 'title',
-        'title-loc-key': 'loc_k',
-        'title-loc-args': ['loc_a'],
+        'title-loc-key': 'title_loc_k',
+        'title-loc-args': ['title_loc_a'],
+        'subtitle': 'subtitle',
+        'subtitle-loc-key': 'subtitle_loc_k',
+        'subtitle-loc-args': ['subtitle_loc_a'],
         'body': 'body',
         'loc-key': 'body_loc_k',
         'loc-args': ['body_loc_a'],
@@ -61,8 +67,11 @@ def test_payload_with_payload_alert(payload_alert):
         'aps': {
             'alert': {
                 'title': 'title',
-                'title-loc-key': 'loc_k',
-                'title-loc-args': ['loc_a'],
+                'title-loc-key': 'title_loc_k',
+                'title-loc-args': ['title_loc_a'],
+                'subtitle': 'subtitle',
+                'subtitle-loc-key': 'subtitle_loc_k',
+                'subtitle-loc-args': ['subtitle_loc_a'],
                 'body': 'body',
                 'loc-key': 'body_loc_k',
                 'loc-args': ['body_loc_a'],