diff --git a/docs/resources.md b/docs/resources.md
index cda096b..fb8513c 100644
--- a/docs/resources.md
+++ b/docs/resources.md
@@ -350,7 +350,7 @@ Heightcoding DEM is in the same format a the dataset expected by `surface-dem` d
 part is used. This DEM can be accompanied with its geoid grid in the same way as `surface-dem` is.
 
 By default all layers from the source dataset are served. Optionally, layer subset can be configured by providing list
-of layer names.
+of layer names. Note that for purposes of [geodata styling](https://github.com/Melown/vts-browser-js/wiki/VTS-Geodata-Format#geo-layer-styles-structure), layers are referred to as [#group](https://github.com/Melown/vts-browser-js/wiki/VTS-Geodata-Format#filters)s.
 
 Since there are not tiles generated by this generator the tile and lod ranges are ignored. To make resource
 configuration more readable we can omit them completely and use array of reference frame IDs for `referenceFrame`.