doc: add note about aft left angle calibration

README.md

@@ -3,10 +3,6 @@
 This repository contains the script used to parse, clean and analyze the raw
 experimental data for the MechaRaptor.
 
-## MechaRaptor
-
-A tandem flapping wing system.
-
 ## Data
 
 The data come from three different sources:
@@ -26,6 +22,13 @@ The data come from three different sources:
 
 [TODO]
 
+## Important notes
+
+- The first series of tests in 2022 had an issue with the data returned by the
+  left aft wing angle sensor. Instead of being encoded in 12-bits, it was
+  returned in 16-bits. Therefore the scripts take that into account and
+  recalibrated the angles properly.
+
 ## License
 
 All scripts used for the date processing of the MechaRaptor experimental data