Solved Sign not updating

I created a method to update any sign with a certain string on the second line.
Can someone tell me why the sign doesn't update.

Code:java

public void sign(String s) {
// Get location of sign
Sign sign = (Sign) loc.getBlock().getState();
if (ChatColor.stripColor(sign.getLine(1)).equalsIgnoreCase(s)) {
sign.setLine(1, ChatColor.GOLD + ChatColor.stripColor(sign.getLine(1)));
sign.setLine(2, ChatColor.WHITE + string);
sign.setLine(3, ChatColor.DARK_PURPLE + otherstring);
// It gets to here but the sign doesn't update.
}
}

EDIT: I found that I could solve the problem using sign.update();