diff --git a/Data-model.md b/Data-model.md
index 3578981..3f58711 100644
--- a/Data-model.md
+++ b/Data-model.md
@@ -230,6 +230,8 @@ Markers data is stored as an unordered array of objects (so element id is _not_
 * `y`: `number` - marker y coordinate
 * `type`: `string` - marker type. If set, style changes will be applied to all markers of the same type. Optional
 * `size`: `number` - marker size in pixels. Optional, default value is `30` (30px)
+* `fill`: `string` - marker pin fill color. Optional, default is `#fff` (white)
+* `stroke`: `string` - marker pin stroke color. Optional, default is `#000` (black)
 * `pin`: `string`: pin element type. Available types are `bubble` and `no` (bare icon). Optional, default is `bubble`
 * `hidden`: `boolean`: `true` if marker should not be rendered. Optional, default is `false` (visible)
 * `dx`: `number` - icon x shift percent. Optional, default is `50` (50%, center)