diff --git a/README.md b/README.md
index 4639659..3eb7b82 100644
--- a/README.md
+++ b/README.md
@@ -13,4 +13,11 @@ The method for estimating wave height and heave from a moving boat implemented h
 ## TODO
 
 * Tilt compensation. No magnetometer needed as we only need vertical projection of acceleation. Mahony algorithm using accel and gyro (without mag) should be enough. Existing github MahonyAHRS implementations need to be modified to take delta_t in update(), instead of assuming fixed sample frequency in integration.
+
+* Rolling min/max algorithm with window
+of about three wave periods samples to produce wave height measurement
+Algorithm: https://github.com/lemire/runningmaxmin
+from Daniel Lemire paper
+
+* Try to find a way for mpu6886 to sample at higher (than 250Hz) frequency