Handy-test-cases.md

@@ -157,7 +157,7 @@ def iterate(fluid, particles, dt, min_nsub=1, contact_tol=1e-8, external_particl
 ```
    The loop also contains instruction to write output files. It is important to note that after moving the grains in the computational loop you have to use the _set_particles()_ function to search the new location of the grains in the mesh.
 
-#### Optional Options
+#### Optional Arguments
 
 Optional options can be specified during the fluid initialization