diff --git a/devices/ble_hci/common-hal/_bleio/Adapter.c b/devices/ble_hci/common-hal/_bleio/Adapter.c
index bc928cc7b9..97468339b0 100644
--- a/devices/ble_hci/common-hal/_bleio/Adapter.c
+++ b/devices/ble_hci/common-hal/_bleio/Adapter.c
@@ -794,7 +794,7 @@ void common_hal_bleio_adapter_start_advertising(bleio_adapter_obj_t *self, bool
     }
 
     if (tx_power != 0) {
-        mp_raise_NotImplementedError();
+        mp_raise_NotImplementedError(translate("Only tx_power=0 supported"));
     }
 
     const uint32_t result = _common_hal_bleio_adapter_start_advertising(