diff --git a/externs/olx.js b/externs/olx.js
index a49a05194c..9c2bde6b7c 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -3806,7 +3806,8 @@ olx.source.ServerVectorOptions.prototype.loader;
 
 
 /**
- * Loading strategy. Default is {@link ol.loadingstrategy.bbox}.
+ * Loading strategy. An {@link ol.loadingstrategy} or a custom function.
+ * Default is {@link ol.loadingstrategy.bbox}.
  * @type {function(ol.Extent, number): Array.<ol.Extent>|undefined}
  */
 olx.source.ServerVectorOptions.prototype.strategy;