diff --git a/README.md b/README.md
index e495c3b..553e106 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ In comments there are default values
 -   `monthNames` : check [#28](https://github.com/krzysu/flot.tooltip/issues/28)
 -   `dayNames` : check [#28](https://github.com/krzysu/flot.tooltip/issues/28)
 -   `shifts` : shift tooltip position regarding mouse pointer for `x` and `y`, negative values are ok
--   `defaultTheme` : plugin have default theme build-in but here you can switch it off and adjust look of tip styling `#flotTip` in your CSS
+-   `defaultTheme` : plugin have default theme build-in but here you can switch it off and adjust look of tip styling `#flotTip` (or whatever you set the id option to) in your CSS
 -   `lines.track` : whether or not to have a tooltip on hover for lines between points
 -   `lines.threshold` : the data-based threshold for the maximum distance from the line to show the tooltip
 -   `onHover` : callback that allows you i.e. change color of the border of the tooltip according to the currently hovered serie