1 files changed, 4 insertions, 1 deletions

diff --git a/docs/feature_bluetooth.md b/docs/feature_bluetooth.md
index 7b450b1ac..08e5f24ac 100644
--- a/docs/feature_bluetooth.md
+++ b/docs/feature_bluetooth.md
@@ -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