lockAxis updated

Added more detail on how to lock an axis.

Author: 8enSmith

README.md

@@ -96,7 +96,7 @@ There are already a number of great Drag & Drop libraries out there (for instanc
 | Property                   | Type              | Default                                                                                                    | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
 |:---------------------------|:------------------|:-----------------------------------------------------------------------------------------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | axis                       | String            | `y`                                                                                                        | Items can be sorted horizontally, vertically or in a grid. Possible values: `x`, `y` or `xy`                                                                                                                                                                                                                                                                                                                                                                           |
-| lockAxis                   | String            |                                                                                                            | If you'd like, you can lock movement to an axis while sorting. This is not something that is possible with HTML5 Drag & Drop                                                                                                                                                                                                                                                                                                                                           |
+| lockAxis                   | String            |                                                                                                            | If you'd like, you can lock movement to an axis while sorting. This is not something that is possible with HTML5 Drag & Drop. Possible values: `x` or `y`.                                                                                                                                                                                                                                                                                                                                           |
 | helperClass                | String            |                                                                                                            | You can provide a class you'd like to add to the sortable helper to add some styles to it                                                                                                                                                                                                                                                                                                                                                                              |
 | transitionDuration         | Number            | `300`                                                                                                      | The duration of the transition when elements shift positions. Set this to `0` if you'd like to disable transitions                                                                                                                                                                                                                                                                                                                                                     |
 | pressDelay                 | Number            | `0`                                                                                                        | If you'd like elements to only become sortable after being pressed for a certain time, change this property. A good sensible default value for mobile is `200`. Cannot be used in conjunction with the `distance` prop.                                                                                                                                                                                                                                                |