diff --git a/lib/src/main/java/io/v/impl/google/lib/discovery/UpdateImpl.java b/lib/src/main/java/io/v/impl/google/lib/discovery/UpdateImpl.java
index 42d1ef3..6ac400d 100644
--- a/lib/src/main/java/io/v/impl/google/lib/discovery/UpdateImpl.java
+++ b/lib/src/main/java/io/v/impl/google/lib/discovery/UpdateImpl.java
@@ -31,6 +31,7 @@
 
     private boolean lost;
     private Advertisement ad;
+    private long timestampNs;
 
     private native void nativeAttachment(
             long nativeRef, VContext ctx, String name, ListenableFutureCallback<byte[]> callback)
@@ -38,10 +39,11 @@
 
     private native void nativeFinalize(long nativeRef);
 
-    private UpdateImpl(long nativeRef, boolean lost, Advertisement ad) {
+    private UpdateImpl(long nativeRef, boolean lost, Advertisement ad, long timestampNs) {
         this.nativeRef = nativeRef;
         this.lost = lost;
         this.ad = ad;
+        this.timestampNs = timestampNs;
     }
 
     @Override
@@ -127,6 +129,11 @@
     }
 
     @Override
+    public long getTimestampNs() {
+        return timestampNs;
+    }
+
+    @Override
     public String toString() {
         return String.format(
                 "{%b %s %s %s %s}",
diff --git a/lib/src/main/java/io/v/v23/discovery/Update.java b/lib/src/main/java/io/v/v23/discovery/Update.java
index fa29e8a..5f84d9e 100644
--- a/lib/src/main/java/io/v/v23/discovery/Update.java
+++ b/lib/src/main/java/io/v/v23/discovery/Update.java
@@ -79,4 +79,9 @@
      * The returned advertisement may not include all attachments.
      */
     Advertisement getAdvertisement();
+
+    /**
+     * Timestamp returns the time when advertising began for the corresponding Advertisement.
+     */
+    long getTimestampNs();
 }