diff --git a/example/libusb/ble_peripheral.c b/example/libusb/ble_peripheral.c
index dd2a60757..4ef056ac5 100644
--- a/example/libusb/ble_peripheral.c
+++ b/example/libusb/ble_peripheral.c
@@ -266,7 +266,7 @@ static void app_run(){
 // @param offset defines start of attribute value
 static uint16_t att_read_callback(uint16_t handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
 
-    printf("READ Callback, handle %04x\n", handle);
+    printf("READ Callback, handle %04x, offset %u, buffer size %u\n", handle, offset, buffer_size);
 
     // find attribute
     int index = att_attribute_for_handle(handle);
diff --git a/example/libusb/profile.gatt b/example/libusb/profile.gatt
index ead7b7af1..5084c78ea 100644
--- a/example/libusb/profile.gatt
+++ b/example/libusb/profile.gatt
@@ -70,8 +70,12 @@ CHARACTERISTIC, 0000F109-0000-1000-8000-00805F9B34FB, READ | WRITE | DYNAMIC | E
 CHARACTERISTIC_USER_DESCRIPTION, READ | WRITE | DYNAMIC | ENCRYPTION_KEY_SIZE_16,
 // - write only
 CHARACTERISTIC, F10A, WRITE | DYNAMIC, 
-// - read/write only
+// - read/write
 CHARACTERISTIC, F10B, READ | WRITE | DYNAMIC, 
+// - read/write without response
+CHARACTERISTIC, F10C, READ | WRITE_WITHOUT_RESPONSE | DYNAMIC, 
+// - read/authenticated signed writes
+CHARACTERISTIC, F10D, READ | AUTHENTICATED_SIGNED_WRITE | DYNAMIC,
 
 // Primary Service with 128-bit UUID, included service
 PRIMARY_SERVICE, 0000F001-0000-1000-8000-00805F9B34FB