diff --git a/radio/1.1/ISap.hal b/radio/1.1/ISap.hal
new file mode 100644
index 0000000..edcf176
--- /dev/null
+++ b/radio/1.1/ISap.hal
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.radio@1.1;
+
+import @1.0::ISap;
+
+interface ISap extends @1.0::ISap {
+    /**
+     * Empty top level interface.
+     */
+};