diff --git a/README.md b/README.md
index 5c653b0..5923357 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,9 @@ Designed specifically to work with the Adafruit BME280 Breakout
 
 These sensors use I2C or SPI to communicate, up to 4 pins are required to interface
 
+Use of this library also required [Adafruit_Sensor](https://github.com/adafruit/Adafruit_Sensor)
+to be installed on your local system.
+
 Adafruit invests time and resources providing this open source code, 
 please support Adafruit and open-source hardware by purchasing 
 products from Adafruit!