Ion-textarea onchange doesn´t trigger

I´m getting really confused. I have following code :

<ion-textarea id="textareaCom" (onchange)="CommentChange($event)" type="text"></ion-textarea>

and this in the typescript file :

public CommentChange(event) {

And it doesn´t trigger somehow. What am I doing wrong ?

Thank you for your help !

I’m not sure but is it onChange with an upcase C?

ionChange, not onChange