diff --git a/core/java/android/os/Bundle.java b/core/java/android/os/Bundle.java
index 1c1f5c034cd9f..102f52566590a 100644
--- a/core/java/android/os/Bundle.java
+++ b/core/java/android/os/Bundle.java
@@ -45,6 +45,7 @@ public final class Bundle extends BaseBundle implements Cloneable, Parcelable {
     @VisibleForTesting
     static final int FLAG_ALLOW_FDS = 1 << 10;
 
+    /** An unmodifiable {@code Bundle} that is always {@link #isEmpty() empty}. */
     public static final Bundle EMPTY;
 
     /**
diff --git a/core/java/android/os/PersistableBundle.java b/core/java/android/os/PersistableBundle.java
index 5e3a34d8848a5..e5e9b5f6f53cc 100644
--- a/core/java/android/os/PersistableBundle.java
+++ b/core/java/android/os/PersistableBundle.java
@@ -47,6 +47,8 @@ import java.util.ArrayList;
 public final class PersistableBundle extends BaseBundle implements Cloneable, Parcelable,
         XmlUtils.WriteMapCallback {
     private static final String TAG_PERSISTABLEMAP = "pbundle_as_map";
+
+    /** An unmodifiable {@code PersistableBundle} that is always {@link #isEmpty() empty}. */
     public static final PersistableBundle EMPTY;
 
     static {