diff --git a/src/main/java/com/clevertap/apns/Notification.java b/src/main/java/com/clevertap/apns/Notification.java
index 166b1d0..2cc6ae2 100644
--- a/src/main/java/com/clevertap/apns/Notification.java
+++ b/src/main/java/com/clevertap/apns/Notification.java
@@ -223,6 +223,11 @@ public Builder badge(int badge) {
             return this;
         }
 
+        public Builder threadId(String threadId) {
+            aps.put("thread-id", threadId);
+            return this;
+        }
+
         public Builder customField(String key, Object value) {
             root.put(key, value);
             return this;