diff --git a/settings.h b/settings.h
index e6ed5cf1..cc02f583 100644
--- a/settings.h
+++ b/settings.h
@@ -138,7 +138,7 @@ e-mail   :  support@circuitsathome.com
 #endif
 
 #if (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || defined(RBL_NRF51822)
-#include <SPI.h> // Use the Arduino SPI library for the Arduino Due
+#include <SPI.h> // Use the Arduino SPI library for the Arduino Due and RedBearLab nRF51822
 #endif
 
 #endif	/* SETTINGS_H */