diff --git a/docs/maps/api-reference.md b/docs/maps/api-reference.md
index d7d7f385..6e98dfb5 100644
--- a/docs/maps/api-reference.md
+++ b/docs/maps/api-reference.md
@@ -252,4 +252,15 @@ WA.showLayer('bottom');
 WA.hideLayer('bottom');
 ```
 
+### Set/Create properties in a layer
+
+```
+WA.setProperty(layerName : string, propertyName : string, propertyValue : string | number | boolean | undefined) : void;
+```
+
+Set the value of the "propertyName" property of the layer "layerName" at "propertyValue". If the property doesn't exist, create the property "propertyName" and set the value of the property at "propertyValue".
+
+```javascript
+WA.setProperty('wikiLayer', 'openWebsite', 'https://www.wikipedia.org/');
+```