diff --git a/docs/resources.md b/docs/resources.md
index 8e0728a..390b01b 100644
--- a/docs/resources.md
+++ b/docs/resources.md
@@ -24,17 +24,28 @@ a JSON file on disk (for JSON resource backend) or a python data tree.
  * `Boolean`: boolean JSON/python value
  * `Array<type>`: array of given type(s)
  * `Optional` given entry is optional
+ * `Enum` string data type limited to enumerated values
  * `?` no fixed name
  
 Complex datatypes:
 
 ```javascript
-ResourceId`: {
+ResourceId: {
     String group        // group this resource belongs to
     String id           // resource identifier (withing group)
 }
 ```
 
+```javascript
+Resampling: Enum {
+    <GDAL-supported resampling algorithms>
+    texture
+    dem
+}
+```
+Where `texture` is resampling suitable for rextures (`average` for scales smaller than 0.5, `cubic` otherwise) 
+and `dem` is suitable for terrain (`average` for scales smaller than 0.5, `cubicspline` otherwise).
+
 Basic resource layout:
 
 ```javascript
@@ -92,10 +103,11 @@ Raster-based bound layer generator. Uses any raster GDAL dataset as its data sou
 
 ```javascript
 definition = {
-    String dataset               // path to GDAL dataset
-    Optional String mask         // path to RF mask or masking GDAL dataset
-    Optional String format       // output image format, "jpg" or "png" (defaults to "jpg")
-    Optional Boolean transparent // Boundlayer is transparent, forces format to "png"
+    String dataset                 // path to GDAL dataset
+    Optional String mask           // path to RF mask or masking GDAL dataset
+    Optional String format         // output image format, "jpg" or "png" (defaults to "jpg")
+    Optional Boolean transparent   // Boundlayer is transparent, forces format to "png"
+    Optional Resampling resampling // Resampling to use for tile texture generation, default 'texture'
 }
 ```
 
@@ -138,7 +150,7 @@ Surface drivers generate a meshed surface that can be used directly as a single
 a remote tileset.
 In addition, a `freelayer.json` file is provided allowing generated surface to act as a `mesh-tiles` free layer.
 
-### Commpon surdace driver configuration options
+### Common surface driver configuration options
 
 All surface drivers support these (optional) options:
 ```javascript
@@ -167,12 +179,9 @@ introspection = {
 This driver generates meshed surface for reference frame's spheroid. If geoid grid is provided the resulting body
 is in fact a geoid.
 
-If a `textureLayerId` entry is present this ID is written into generated meshes as a default bound layer to use
-if nothing else is mapped on the surface. Otherwise surface is completely texture less.
-
 ```javascript
 definition = {
-    Optional Int textureLayerId  // numeric bound layer ID
+    // see common surface driver configuration options above
 }
 ```
 
@@ -190,15 +199,14 @@ vertical system to use geoid support. I.e. either they share the same ellipsoid
 local system that approximates the geoid at given place. One working example is data in Krovak's projection that can
 be reinterpreted as heights above WGS84+EGM96 without any significant error.
 
-If a `textureLayerId` entry is present this ID is written into generated meshes as a default bound layer to use
-if nothing else is mapped on the surface. Otherwise surface is completely texture less.
-
 All `surface-dem` input datasets are registered in internal map od available DEM's under its `group-id` identifier
 and can be referenced from various `geodata`resources for 2D features heightcofing. Optionially, input dataset can
 be registered in this map under an alias. See more in the `geodata` resources documentation. 
 
 ```javascript
 definition = {
+    // see common surface driver configuration options above
+    
     String dataset                    // path to complex dataset
     Optional String mask              // optional mask, generated by mapproxy-rf-mask tool
     Optional Int textureLayerId       // numeric bound layer ID