diff --git a/core/api/module-lib-current.txt b/core/api/module-lib-current.txt
index 09b42f2c6c70b..230863da46618 100644
--- a/core/api/module-lib-current.txt
+++ b/core/api/module-lib-current.txt
@@ -19,6 +19,14 @@ package android.net {
     method public int getResourceId();
   }
 
+  public final class NetworkAgentConfig implements android.os.Parcelable {
+    method @Nullable public String getSubscriberId();
+  }
+
+  public static final class NetworkAgentConfig.Builder {
+    method @NonNull public android.net.NetworkAgentConfig.Builder setSubscriberId(@Nullable String);
+  }
+
   public final class NetworkCapabilities implements android.os.Parcelable {
     field public static final int TRANSPORT_TEST = 7; // 0x7
   }
diff --git a/core/java/android/net/NetworkAgentConfig.java b/core/java/android/net/NetworkAgentConfig.java
index fe1268d79b891..664c2650ff0c3 100644
--- a/core/java/android/net/NetworkAgentConfig.java
+++ b/core/java/android/net/NetworkAgentConfig.java
@@ -16,6 +16,8 @@
 
 package android.net;
 
+import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
+
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SystemApi;
@@ -125,6 +127,7 @@ public final class NetworkAgentConfig implements Parcelable {
      * @return the subscriber ID, or null if none.
      * @hide
      */
+    @SystemApi(client = MODULE_LIBRARIES)
     @Nullable
     public String getSubscriberId() {
         return subscriberId;
@@ -275,6 +278,7 @@ public final class NetworkAgentConfig implements Parcelable {
          * @hide
          */
         @NonNull
+        @SystemApi(client = MODULE_LIBRARIES)
         public Builder setSubscriberId(@Nullable String subscriberId) {
             mConfig.subscriberId = subscriberId;
             return this;