Added note about ap examples.

Author: MichaelClerx

README.md

@@ -4,7 +4,7 @@ This repository contains examples showing how to fit Myokit models to data using
 It includes:
 
 - a [detailed tutorial](ion-currents-tutorial/README.md) showing how to fit kinetic parameters of ion current models; and
-- a [set of recipes](action-potential-tutorial/README.md) for fitting maximum conductances and permeabilities in a model of the cardiac action potential (AP).
+- a [set of recipes](action-potential-tutorial/README.md) for fitting maximum conductances and permeabilities in a model of the cardiac action potential (AP). NOTE: We're not entirely sure this is a good idea!
 
 The AP examples are a great place to start if you've done fitting before, and would like to spend five minutes seeing how it can be done with Myokit and PINTS.
 The ion current tutorial goes into much more depth, and includes topics that are useful in AP model fitting too, such as defining boundaries and parameter transformations.