diff --git a/layers/transportation/etl_diagram.png b/layers/transportation/etl_diagram.png
index e4a703a..338152e 100644
Binary files a/layers/transportation/etl_diagram.png and b/layers/transportation/etl_diagram.png differ
diff --git a/layers/transportation/layer.sql b/layers/transportation/layer.sql
index 504ba57..696a819 100644
--- a/layers/transportation/layer.sql
+++ b/layers/transportation/layer.sql
@@ -4,7 +4,7 @@ $$ LANGUAGE SQL IMMUTABLE STRICT;
 
 
 -- etldoc: layer_transportation[shape=record fillcolor=lightpink, style="rounded,filled",
--- etldoc:     label="<sql> layer_transportation |<z4> z4 |<z5> z5 |<z6> z6 |<z7> z7 |<z8> z8 |<z9z10> z9-z10 |<z11> z11 |<z12> z12|<z13> z13|<z14_> z14+" ] ;
+-- etldoc:     label="<sql> layer_transportation |<z4> z4 |<z5> z5 |<z6> z6 |<z7> z7 |<z8> z8 |<z9> z9 |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13|<z14_> z14+" ] ;
 CREATE OR REPLACE FUNCTION layer_transportation(bbox geometry, zoom_level int)
 RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int, brunnel TEXT, service TEXT) AS $$
     SELECT
@@ -75,7 +75,8 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
         WHERE zoom_level = 8
         UNION ALL
 
-        -- etldoc: osm_highway_linestring_gen2  ->  layer_transportation:z9z10
+        -- etldoc: osm_highway_linestring_gen2  ->  layer_transportation:z9
+        -- etldoc: osm_highway_linestring_gen2  ->  layer_transportation:z10
         SELECT
             osm_id, geometry, highway, NULL AS railway, NULL AS service,
             NULL::boolean AS is_bridge, NULL::boolean AS is_tunnel,