diff --git a/docs/plugins/jspsych-free-sort.md b/docs/plugins/jspsych-free-sort.md
index 20649154..d55ee988 100644
--- a/docs/plugins/jspsych-free-sort.md
+++ b/docs/plugins/jspsych-free-sort.md
@@ -15,13 +15,14 @@ Parameter | Type | Default Value | Description
 stimuli | array | *undefined* | Each element of this array is an image path.
 stim_height | numeric | 100 | The height of the images in pixels.
 stim_width | numeric | 100 | The width of the images in pixels.
+scale_factor | numeric | 1.5 | How much larger to make the stimulus while moving (1 = no scaling).
 sort_area_height | numeric | 800 | The height of the container that subjects can move the stimuli in. Stimuli will be constrained to this area.
 sort_area_width | numeric | 800 | The width of the container that subjects can move the stimuli in. Stimuli will be constrained to this area.
+sort_area_shape | string | "ellipse" | The shape of the sorting area, can be "ellipse" or "square".
 prompt | string | null | This string can contain HTML markup. The intention is that it can be used to provide a reminder about the action the subject is supposed to take (e.g., which key to press).
 prompt_location | string | "above" | Indicates whether to show the prompt `"above"` or `"below"` the sorting area.
 button_label | string |  'Continue' | The text that appears on the button to continue to the next trial.
 
-
 ## Data Generated
 
 In addition to the [default data collected by all plugins](overview#datacollectedbyplugins), this plugin collects the following data for each trial.