diff --git a/include/hardware/bluetooth.h b/include/hardware/bluetooth.h
index 6f95684..da7f4b8 100644
--- a/include/hardware/bluetooth.h
+++ b/include/hardware/bluetooth.h
@@ -318,7 +318,7 @@
 
 /** Bluetooth Legacy PinKey Request callback */
 typedef void (*pin_request_callback)(bt_bdaddr_t *remote_bd_addr,
-                                        bt_bdname_t *bd_name, uint32_t cod);
+                                        bt_bdname_t *bd_name, uint32_t cod, bool min_16_digit);
 
 /** Bluetooth SSP Request callback - Just Works & Numeric Comparison*/
 /** pass_key - Shall be 0 for BT_SSP_PAIRING_VARIANT_CONSENT &
diff --git a/include/hardware/bt_sock.h b/include/hardware/bt_sock.h
index 69775e0..5d206d7 100644
--- a/include/hardware/bt_sock.h
+++ b/include/hardware/bt_sock.h
@@ -22,6 +22,7 @@
 #define BTSOCK_FLAG_AUTH (1 << 1)
 #define BTSOCK_FLAG_NO_SDP (1 << 2)
 #define BTSOCK_FLAG_AUTH_MITM (1 << 3)
+#define BTSOCK_FLAG_AUTH_16_DIGIT (1 << 4)
 
 typedef enum {
     BTSOCK_RFCOMM = 1,