diff --git a/docs/contents.rst b/docs/contents.rst
index 946eb24..6563315 100644
--- a/docs/contents.rst
+++ b/docs/contents.rst
@@ -32,6 +32,14 @@ Lightcone
 .. automodule:: tools21cm.lightcone
     :members:
 
+N-Body Tools 
+------------
+.. automodule:: tools21cm.nbody_tools
+    :members:
+    
+.. automodule:: tools21cm.nbody_file
+    :members:
+
 Point statistics
 ----------------
 .. automodule:: tools21cm.statistics
diff --git a/src/tools21cm/nbody_tools.py b/src/tools21cm/nbody_tools.py
index 03e848e..accddf3 100644
--- a/src/tools21cm/nbody_tools.py
+++ b/src/tools21cm/nbody_tools.py
@@ -36,15 +36,15 @@ def ParticleMass_to_ParticleNumber(Lbox, particle_mass, cosmo='Planck18'):
     print('Particles | along each direction = {} | total = {}'.format(particle_number,particle_number**3))
     return particle_number.value
 
-def HaloMass_to_ParticleNumber(Lbox, halo_mass, particles_in_halo, cosmo='Planck18'):
+def halo_mass_to_particle_number(Lbox, halo_mass, particles_in_halo, cosmo='Planck18'):
     particle_mass = halo_mass/particles_in_halo
-    return ParticleMass_to_ParticleNumber(Lbox, particle_mass, cosmo=cosmo)
+    return particle_number_to_particle_mass(Lbox, particle_mass, cosmo=cosmo)
 
-def ParticleNumber_to_ParticleMass(Lbox, particle_each_direction=None, particle_total=None, cosmo='Planck18'):
+def particle_number_to_particle_mass(Lbox, particle_each_direction=None, particle_total=None, cosmo='Planck18'):
     particle_number = particle_each_direction if particle_each_direction is not None else np.cbrt(particle_total)
     cosmo = _set_cosmo(cosmo)
     if not isinstance(Lbox, units.Quantity): 
         Lbox *= units.Mpc 
         print('As the box length provided is not using Astropy units, Mpc is assumed here.')
     particle_mass = cosmo.critical_density0*cosmo.Om0*(Lbox/particle_number)**3
-    return particle_mass.to('Msun')
\ No newline at end of file
+    return particle_mass.to('Msun')