diff --git a/gen_etl_graph_poi.sh b/gen_etl_graph_poi.sh
new file mode 100755
index 0000000..f565ba8
--- /dev/null
+++ b/gen_etl_graph_poi.sh
@@ -0,0 +1,22 @@
+
+
+ID=poi
+DOT=${ID}.dot
+
+echo "digraph G
+{    
+rankdir=LR;
+" > $DOT
+
+cat ./layers/${ID}/mapping.yaml | grep    "# etldoc:" |  sed 's/# etldoc://g'  >>$DOT
+
+cat ./layers/${ID}/class.sql    | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+cat ./layers/${ID}/layer.sql    | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+
+echo "
+}
+" >> $DOT
+
+cat $DOT
+
+dot -Tpng $DOT > layer_${ID}_etl.png
diff --git a/layers/poi/layer.sql b/layers/poi/layer.sql
index 0a0a603..b82dc41 100644
--- a/layers/poi/layer.sql
+++ b/layers/poi/layer.sql
@@ -1,3 +1,7 @@
+
+-- etldoc: layer_poi[shape=record fillcolor=lightpink, style="rounded,filled",  
+-- etldoc:     label="layer_poi | <z14_> z14_" ] ;
+
 CREATE OR REPLACE FUNCTION layer_poi(bbox geometry, zoom_level integer, pixel_width numeric)
 RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, class text, subclass text, "rank" int) AS $$
     SELECT osm_id, geometry, name, NULLIF(name_en, ''), poi_class(subclass) AS class, subclass,
@@ -5,6 +9,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, class t
             PARTITION BY LabelGrid(geometry, 100 * pixel_width)
             ORDER BY poi_class_rank(poi_class(subclass)) ASC, length(name) DESC
         )::int AS "rank"
+    -- etldoc: osm_poi_point ->  layer_poi:z14_        
     FROM osm_poi_point
     WHERE geometry && bbox
       AND zoom_level >= 14
diff --git a/layers/poi/mapping.yaml b/layers/poi/mapping.yaml
index 71cb792..37c7193 100644
--- a/layers/poi/mapping.yaml
+++ b/layers/poi/mapping.yaml
@@ -1,4 +1,5 @@
 tables:
+  # etldoc: imposm3 -> osm_poi_point
   poi_point:
     type: point
     fields: