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+Extending Tether
+-----
+
+Tether has a module system which can be used to modify Tether's positioning, or just do something each time the Tether is moved.
+
+Tether has an array called `Tether.modules`, push onto it to add a module:
+
+```coffeescript
+Tether.modules.push
+  position: ({top, left}) ->
+    top += 10
+
+    {top, left}
+```
+
+#### Position
+
+Your position function can either return a new object with `top` and `left`, `null`/`undefined` to leave the coordinates unchanged, or
+`false` to cancel the positioning.
+
+The position function is passed an object with the following elements:
+
+```javascript
+{
+  left, // The element's new position, from the top left corner of the page
+  top,
+  targetAttachment, // The targetAttachment, with 'auto' resolved to an actual attachment
+  targetPos, // The coordinates of the target
+  attachment, // The attachment, as passed in the option
+  elementPos, // The coordinates of the element
+  offset, // The offset, after it's converted into pixels and the manual offset is added
+  targetOffset, // The attachment is converted into an offset and is included in these values
+  manualOffset, // The manual offset, in pixels
+  manualTargetOffset
+}
+```
+
+It is called with the Tether instance as its context (`this`).
+
+#### Initialize
+
+Modules can also have an `initialize` function which will be called when a new tether is created.  The initialize function
+is also called with the Tether instance as its context.
+
+```coffeescript
+Tether.modules.push
+  initialize: ->
+    console.log "New Tether Created!", @
+```
+
+#### Examples
+
+[Constraints](https://github.com/HubSpot/tether/blob/master/coffee/constraint.coffee) and [shift](https://github.com/HubSpot/tether/blob/master/coffee/shift.coffee) are both implemented as modules.
+[Mark Attachment](https://github.com/HubSpot/tether/blob/master/coffee/markAttachment.coffee) is used by the docs.