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-rw-r--r--docs/library/ubluetooth.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/library/ubluetooth.rst b/docs/library/ubluetooth.rst
index 62a823924..2609ac01b 100644
--- a/docs/library/ubluetooth.rst
+++ b/docs/library/ubluetooth.rst
@@ -48,6 +48,8 @@ Configuration
- ``'mac'``: Returns the device MAC address. If a device has a fixed address
(e.g. PYBD) then it will be returned. Otherwise (e.g. ESP32) a random
address will be generated when the BLE interface is made active.
+ Note: on some ports, accessing this value requires that the interface is
+ active (so that the MAC address can be queried from the controller).
- ``'rxbuf'``: Get/set the size in bytes of the internal buffer used to store
incoming events. This buffer is global to the entire BLE driver and so