diff --git a/framework/src/android/net/QosCallbackException.java b/framework/src/android/net/QosCallbackException.java
index b80cff4..72430d2 100644
--- a/framework/src/android/net/QosCallbackException.java
+++ b/framework/src/android/net/QosCallbackException.java
@@ -57,6 +57,9 @@
     private static final String TAG = "QosCallbackException";
 
     // Types of exceptions supported //
+    // The constants are used for the sendQosCallbackError system API, so they must not be changed
+    // as there may be callers relying on their historical values to call that API.
+    // TODO: mark the constants as @SystemApi, since they are necessary to call a system API.
     /** {@hide} */
     public static final int EX_TYPE_FILTER_NONE = 0;
 
@@ -67,13 +70,13 @@
     public static final int EX_TYPE_FILTER_SOCKET_NOT_BOUND = 2;
 
     /** {@hide} */
-    public static final int EX_TYPE_FILTER_SOCKET_NOT_CONNECTED = 3;
+    public static final int EX_TYPE_FILTER_NOT_SUPPORTED = 3;
 
     /** {@hide} */
-    public static final int EX_TYPE_FILTER_NOT_SUPPORTED = 4;
+    public static final int EX_TYPE_FILTER_SOCKET_LOCAL_ADDRESS_CHANGED = 4;
 
     /** {@hide} */
-    public static final int EX_TYPE_FILTER_SOCKET_LOCAL_ADDRESS_CHANGED = 5;
+    public static final int EX_TYPE_FILTER_SOCKET_NOT_CONNECTED = 5;
 
     /** {@hide} */
     public static final int EX_TYPE_FILTER_SOCKET_REMOTE_ADDRESS_CHANGED = 6;