If statement does not work when condition is met

Here is my code:

var count = 2;
var decrementAmount = 1;

function reduceVariable() {
    count -= decrementAmount;
}

$("#button").click(function() {
    reduceVariable();
});

if (count == 0) {
    $("#avrageReactionTime").html("Hello");
};

When i click my button twice the div that has the id avrageReactionTime does not change to have the text hello. Why do i have this problem...