Update README.md

README.md

@@ -15,9 +15,19 @@ https://github.com/BDuenweg/Lattice-Boltzmann-weights
 Assignmentlist not yet implemented !
 
 ## Usage:
+Get lattices by their established name: 
+
+``` Python
+from lbmweights import Lattice
+Lattice().from_name("D2V37").weights
+```
+
+Or by their dimension, order and shell list: 
+
 ``` Python
 from lbmweights import Lattice
 lattice = Lattice(dimension=2, order=4, shell_list=[1, 2, 4])
 lattice.calculate_weights(boundary="inf")
-c_s_sq, weights, velocities = lattice.velocity_set()
-```
\ No newline at end of file
+c_s_sq, weights, velocities = lattice.velocity_set()  # D2Q9
+```
+