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diff --git a/docs/feature_bluetooth.md b/docs/feature_bluetooth.md
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@@ -26,7 +26,10 @@ A Bluefruit UART friend can be converted to an SPI friend, however this [require
<!-- FIXME: Document bluetooth support more completely. -->
## Bluetooth Rules.mk Options
-Use only one of these
+
+The currently supported Bluetooth chipsets do not support [N-Key Rollover (NKRO)](reference_glossary.md#n-key-rollover-nkro), so `rules.mk` must contain `NKRO_ENABLE = no`.
+
+Use only one of these to enable Bluetooth:
* BLUETOOTH_ENABLE = yes (Legacy Option)
* BLUETOOTH = RN42
* BLUETOOTH = AdafruitBLE