diff --git a/core/api/module-lib-current.txt b/core/api/module-lib-current.txt
index ee8abf1c18945..9349770ee4fd9 100644
--- a/core/api/module-lib-current.txt
+++ b/core/api/module-lib-current.txt
@@ -8,6 +8,20 @@ package android.app {
 
 }
 
+package android.net {
+
+  public final class TcpRepairWindow {
+    ctor public TcpRepairWindow(int, int, int, int, int, int);
+    field public final int maxWindow;
+    field public final int rcvWnd;
+    field public final int rcvWndScale;
+    field public final int rcvWup;
+    field public final int sndWl1;
+    field public final int sndWnd;
+  }
+
+}
+
 package android.os {
 
   public class Binder implements android.os.IBinder {
diff --git a/core/java/android/net/TcpRepairWindow.java b/core/java/android/net/TcpRepairWindow.java
index 86034f0a76ed2..f062fa9034eae 100644
--- a/core/java/android/net/TcpRepairWindow.java
+++ b/core/java/android/net/TcpRepairWindow.java
@@ -16,12 +16,15 @@
 
 package android.net;
 
+import android.annotation.SystemApi;
+
 /**
  * Corresponds to C's {@code struct tcp_repair_window} from
  * include/uapi/linux/tcp.h
  *
  * @hide
  */
+@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
 public final class TcpRepairWindow {
     public final int sndWl1;
     public final int sndWnd;