diff --git a/externs/olx.js b/externs/olx.js
index c939b81be9..c8f3810d1a 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -81,7 +81,8 @@ olx.GeolocationOptions.prototype.tracking;
 
 
 /**
- * Tracking options.
+ * Tracking options. See
+ * {@link http://www.w3.org/TR/geolocation-API/#position_options_interface}.
  * @type {GeolocationPositionOptions|undefined}
  */
 olx.GeolocationOptions.prototype.trackingOptions;
@@ -3477,9 +3478,9 @@ olx.source.ImageWMSOptions.prototype.logo;
 
 
 /**
- * WMS request parameters. At least a `LAYERS` param is required. `STYLES` is ``
- * by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX` and
- * `CRS` (`SRS` for WMS version < 1.3.0) will be set dynamically.
+ * WMS request parameters. At least a `LAYERS` param is required. `STYLES` is
+ * `''` by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX`
+ * and `CRS` (`SRS` for WMS version < 1.3.0) will be set dynamically.
  * @type {Object.<string,*>}
  */
 olx.source.ImageWMSOptions.prototype.params;
@@ -3758,9 +3759,9 @@ olx.source.TileWMSOptions.prototype.attributions;
 
 
 /**
- * WMS request parameters. At least a `LAYERS` param is required. `STYLES` is ``
- * by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX` and
- * `CRS` (`SRS` for WMS version < 1.3.0) will be set dynamically.
+ * WMS request parameters. At least a `LAYERS` param is required. `STYLES` is
+ * `''` by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX`
+ * and `CRS` (`SRS` for WMS version < 1.3.0) will be set dynamically.
  * @type {Object.<string,*>}
  */
 olx.source.TileWMSOptions.prototype.params;