diff --git a/gen_etl_graph_housenumber.sh b/gen_etl_graph_housenumber.sh
new file mode 100755
index 0000000..37c12a9
--- /dev/null
+++ b/gen_etl_graph_housenumber.sh
@@ -0,0 +1,20 @@
+
+
+DOT=housenumber.dot
+
+echo "digraph G
+{    
+rankdir=LR;
+" > $DOT
+
+cat ./layers/housenumber/mapping.yaml              | grep    "# etldoc:" |  sed 's/# etldoc://g'  >>$DOT
+cat ./layers/housenumber/housenumber_centroid.sql  | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+cat ./layers/housenumber/layer.sql                 | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT 
+
+echo "
+}
+" >> $DOT
+
+cat $DOT
+
+dot -Tpng $DOT > layer_housenumber_etl.png
diff --git a/layers/housenumber/housenumber_centroid.sql b/layers/housenumber/housenumber_centroid.sql
index c490a24..8a81d6a 100644
--- a/layers/housenumber/housenumber_centroid.sql
+++ b/layers/housenumber/housenumber_centroid.sql
@@ -1,2 +1,4 @@
+
+-- etldoc: osm_housenumber_point -> osm_housenumber_point
 UPDATE osm_housenumber_point SET geometry=topoint(geometry)
 WHERE ST_GeometryType(geometry) <> 'ST_Point';
diff --git a/layers/housenumber/layer.sql b/layers/housenumber/layer.sql
index 518f891..21f98f3 100644
--- a/layers/housenumber/layer.sql
+++ b/layers/housenumber/layer.sql
@@ -1,5 +1,10 @@
+
+-- etldoc: layer_housenumber[shape=record fillcolor=lightpink, style="rounded,filled",  
+-- etldoc:     label="layer_housenumber | <z14_> z14_" ] ;
+
 CREATE OR REPLACE FUNCTION layer_housenumber(bbox geometry, zoom_level integer)
 RETURNS TABLE(osm_id bigint, geometry geometry, housenumber text) AS $$
+   -- etldoc: osm_housenumber_point -> layer_housenumber:z14_
     SELECT osm_id, geometry, housenumber FROM osm_housenumber_point
     WHERE zoom_level >= 14 AND geometry && bbox;
 $$ LANGUAGE SQL IMMUTABLE;
diff --git a/layers/housenumber/mapping.yaml b/layers/housenumber/mapping.yaml
index 939c953..cf5f255 100644
--- a/layers/housenumber/mapping.yaml
+++ b/layers/housenumber/mapping.yaml
@@ -1,4 +1,7 @@
+
 tables:
+
+  # etldoc: imposm3 -> osm_housenumber_point
   housenumber_point:
     type: geometry
     fields: