diff --git a/libgy521.h b/libgy521.h
index c1cc485..225328c 100644
--- a/libgy521.h
+++ b/libgy521.h
@@ -9,6 +9,7 @@ extern float getAccelerometerData(char axis, int g);
 extern void setGyroscopeRange(int range);
 extern int readGyroscopeRange(int raw);
 extern float getGyroscopeData(char axis);
+float getAccelerometerAverage(char axis, int g, unsigned int measurements);
 extern float getAngleX(void);
 extern float getAngleY(void);
 extern float getAngleZ(void);