more point docs updates

markdown/dev/reference/api/point/sitson/en.md

@@ -1,14 +1,26 @@
 ---
-title: sitsOn()
+title: Point.sitsOn()
 ---
 
+Returns `true` if this point has the _exact_ same coordinates as the point you pass to it.
+
+<Note>
+
+###### Too exact?
+
+This method is _very_ precise, so points with an X-coordinate of `10` and `10.0001`
+are considered to be different.
+
+To check if two points have the same coordinates rounded to the nearest
+millimeter, use [`Point.sitsRoughlyOn()`](/reference/api/point/sitsroughlyon/) instead.
+
+</Note>
+
 ```js
 bool point.sitsOn(Point check)
 ```
 
-Returns true if the point has the same coordinates as the one you pass to it.
-
-<Example 
+<Example
   part="point_sitson"
   caption="An example of the Point.sitsOn() method"
 />