diff --git a/ui/jquery.ui.spinner.js b/ui/jquery.ui.spinner.js
index a18cc3b3b3..49bbc7bf27 100644
--- a/ui/jquery.ui.spinner.js
+++ b/ui/jquery.ui.spinner.js
@@ -234,6 +234,7 @@ $.widget( "ui.spinner", {
 		}
 
 		// TODO refactor, maybe figure out some non-linear math
+		// x*x*x/50000 - x*x/500 + 17*x/200 + 1
 		var newVal = this.value() + step * (this.options.incremental &&
 			this.counter > 20
 				? this.counter > 100