diff --git a/book/00_data_structure.md b/book/00_data_structure.md
index 9ef65d7..3da26b3 100644
--- a/book/00_data_structure.md
+++ b/book/00_data_structure.md
@@ -31,8 +31,8 @@
 | attribute name | data type | description                                                                                                                                                                                                                                                                                                                               |
 |----------------|-----------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | area           | BIGINT    | The area of the OSM element in m². Will always be `0` for the following geometry types: `Point`, `LineString`, `GeometryCollection`.                                                                                                                                                                                                      |
-| area_delta     | BIGINT    | The length of the OSM element in m. Will always be `0` for the following geometry types: `Point`, `Polygon`, `MultiPolygon`, `GeometryCollection`.                                                                                                                                                                                        |
-| length         | BIGINT    |                                                                                                                                                                                                                                                                                                                                           |
+| area_delta     | BIGINT    |                                                                                                                                                                                                                                                                                                                                           |
+| length         | BIGINT    | The length of the OSM element in m. Will always be `0` for the following geometry types: `Point`, `Polygon`, `MultiPolygon`, `GeometryCollection`.                                                                                                                                                                                                                                                                                                                                              |
 | length_delta   | BIGINT    |                                                                                                                                                                                                                                                                                                                                           |
 | xzcode         | STRUCT    |                                                                                                                                                                                                                                                                                                                                           |
 | xzcode.level   | INTEGER   |                                                                                                                                                                                                                                                                                                                                           |
@@ -54,7 +54,7 @@
 | h3_r5          | UBIGINT   | Cell ID in H3 hierarchical geospatial index at resolution level 5. We have used the OSM element centroid location to determine the H3 cell ID. There are about 2 Million cells at this level globally. The cell size varies between 150 - 300 km². Check [H3 docs](https://h3geo.org/docs/) for more details.                             |
 | geometry_type  | VARCHAR   | Potential values are: `Point`, `LineString`, `Polygon`, `MultiPolygon`, `GeometryCollection`, `InvalidGeometry`.                                                                                                                                                                                                                          |
 | geometry_valid | BOOLEAN   |                                                                                                                                                                                                                                                                                                                                           |
-| geometry       | VARCHAR   | The geometry of the OSM element in [WKT format](https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry).                                                                                                                                                                                                                                                                                        |
+| geometry       | VARCHAR   | The geometry of the OSM element in [WKT format](https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry).                                                                                                                                                                                                                |
 
 
 ## Special Attributes for OSM Map Features