diff --git a/layers/water/mapping.yaml b/layers/water/mapping.yaml
index 1123aa9..dadd72b 100644
--- a/layers/water/mapping.yaml
+++ b/layers/water/mapping.yaml
@@ -85,4 +85,5 @@ tables:
       - canal
       - drain
       - ditch
+      - dock
     type: polygon
diff --git a/layers/water/water.sql b/layers/water/water.sql
index 4d45469..2b4e88c 100644
--- a/layers/water/water.sql
+++ b/layers/water/water.sql
@@ -1,5 +1,9 @@
 CREATE OR REPLACE FUNCTION water_class(waterway TEXT) RETURNS TEXT AS $$
-    SELECT CASE WHEN waterway='' THEN 'lake' ELSE 'river' END;
+    SELECT CASE
+           WHEN waterway='' THEN 'lake'
+           WHEN waterway='dock' THEN 'dock'
+           ELSE 'river'
+   END;
 $$ LANGUAGE SQL IMMUTABLE;