diff --git a/README.rst b/README.rst
index cbec26e..61a5be4 100644
--- a/README.rst
+++ b/README.rst
@@ -32,6 +32,8 @@ Please ensure all dependencies are available on the CircuitPython filesystem.
 This is easily achieved by downloading
 `the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
 
+Note: This driver requires too much RAM to be used on SAMD21 based devices.
+
 Installing from PyPI
 =====================
 On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
diff --git a/adafruit_mpu6050.py b/adafruit_mpu6050.py
index 9be50d4..a92f3db 100644
--- a/adafruit_mpu6050.py
+++ b/adafruit_mpu6050.py
@@ -6,7 +6,9 @@
 `adafruit_mpu6050`
 ================================================================================
 
-CircuitPython helper library for the MPU6050 6-DoF Accelerometer and Gyroscope
+CircuitPython helper library for the MPU6050 6-DoF Accelerometer and Gyroscope.
+
+This driver requires too much RAM to be used on SAMD21 based devices.
 
 
 * Author(s): Bryan Siepert