Update README.md

README.md

@@ -15,7 +15,7 @@ It enables us to reconstruct buildings from different sources and their combinat
   - Extrusion of footprints containing height or floor number attributes,
   - The import of existing building models.
 
-The reconstruction using the combination of point clouds and 2D polygons can be done in [LoD2.2, LoD1.3, and LoD1.2](https://3d.bk.tudelft.nl/lod/). You can use the [complexity factor](https://github.com/tudelft3d/City4CFD/wiki/Features#buildings) to tune the overall complexity of the reconstructed geometry.
+The reconstruction using the combination of point clouds and 2D polygons can be done in [LoD2.2, LoD1.3, and LoD1.2](https://3d.bk.tudelft.nl/lod/). You can use the [complexity factor](https://github.com/tudelft3d/City4CFD/wiki/Features#buildings) to tune the overall complexity of the reconstructed geometry. The LoD2.2 and LoD1.3 reconstructions are based on [roofer](https://github.com/3DBAG/roofer).
 
 The resulting geometry is watertight -- buildings and surfaces are seamlessly integrated into a terrain.
 
@@ -39,7 +39,7 @@ You can directly compile City4CFD on your system using cmake, run it through a D
 
 ### Build from source
 The following libraries are required to build the project:
-- [CGAL](https://www.cgal.org/) >= 5.5
+- [CGAL](https://www.cgal.org/) >= 6.0.1
 - Boost >= 1.66
 - Eigen >= 3.3.4
 - GMP >= 4.2