Add tweaking section to readme

README.md

@@ -36,3 +36,10 @@ Scrolling your mouse will speed up or slow down time.
 | 6     | makes points overshoot                              |
 | f     | enables FPS counter                                 |
 | d     | enables debug mode (including FPS counter)          |
+
+### Tweaking
+
+There are many more configurable values that affect the animation which don't
+have an interaction or keybinding. You can find all of these at the top of
+[`proximity.js`](/js/proximity.js). If you are feeling experimental, you can
+clone the repo and edit those yourself.

notes.md

@@ -9,3 +9,6 @@ If lines make a connected polygon, shade the inside of it with the average color
 of all vertices composing the polygon. The more distant the points (and the
 larger the polygon) the more dark the color is shaded.
   * Hard. Not sure where to start with this.
+
+Add a bunch of dials and switches to the UI to tweak the different configurable
+values.