diff --git a/biometrics/fingerprint/2.1/IBiometricsFingerprintClientCallback.hal b/biometrics/fingerprint/2.1/IBiometricsFingerprintClientCallback.hal
new file mode 100644
index 0000000..365e905
--- /dev/null
+++ b/biometrics/fingerprint/2.1/IBiometricsFingerprintClientCallback.hal
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2016 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.biometrics.fingerprint@2.1;
+
+interface IBiometricsFingerprintClientCallback {
+    /* This function is the response chanel for all messages
+     * coming from the fingerprint HAL to the framework
+     *
+     * @param msg a union of message structures identified by
+     * FingerprintMsg.type
+     */
+    oneway notify(FingerprintMsg msg);
+};