document requirement of per-type masses

doc/src/fix_charge_regulation.rst

@@ -253,11 +253,11 @@ built with that package.  See the :doc:`Build package <Build_package>`
 page for more info.
 
 The :doc:`atom_style <atom_style>`, used must contain the charge
-property, for example, the style could be *charge* or *full*. Only
+property and have per atom type masses, for example, the style could be
-usable for 3D simulations. Atoms specified as free ions cannot be part
+*charge* or *full*. Only usable for 3D simulations.  Atoms specified as
-of rigid bodies or molecules and cannot have bonding interactions. The
+free ions cannot be part of rigid bodies or molecules and cannot have
-scheme is limited to integer charges, any atoms with non-integer charges
+bonding interactions.  The scheme is limited to integer charges, any
-will not be considered by the fix.
+atoms with non-integer charges will not be considered by the fix.
 
 All interaction potentials used must be continuous, otherwise the MD
 integration and the particle exchange MC moves do not correspond to the

doc/src/fix_gcmc.rst

@@ -440,8 +440,11 @@ This fix is part of the MC package.  It is only enabled if LAMMPS was
 built with that package.  See the :doc:`Build package <Build_package>`
 doc page for more info.
 
+This fix style requires an :doc:`atom style <atom_style>` with per atom
+type masses.
+
 Do not set "neigh_modify once yes" or else this fix will never be
-called.  Reneighboring is required.
+called.  Reneighboring is **required**.
 
 Only usable for 3D simulations.
 

doc/src/fix_sgcmc.rst

@@ -155,6 +155,9 @@ This fix is part of the MC package. It is only enabled if LAMMPS was
 built with that package.  See the :doc:`Build package <Build_package>`
 page for more info.
 
+This fix style requires an :doc:`atom style <atom_style>` with per atom
+type masses.
+
 At present the fix provides optimized subroutines for EAM type
 potentials (see above) that calculate potential energy changes due to
 *local* atom type swaps very efficiently.  Other potentials are

doc/src/fix_widom.rst

@@ -195,8 +195,11 @@ doc page for more info.
 Do not set "neigh_modify once yes" or else this fix will never be
 called.  Reneighboring is **required**.
 
-Can be run in parallel, but aspects of the GCMC part will not scale well
+This fix style requires an :doc:`atom style <atom_style>` with per atom
-in parallel. Only usable for 3D simulations.
+type masses.
+
+Can be run in parallel, but some aspects of the insertion procedure
+will not scale well in parallel. Only usable for 3D simulations.
 
 
 Related commands

doc/src/pair_dsmc.rst

@@ -138,8 +138,12 @@ This pair style can only be used via the *pair* keyword of the
 Restrictions
 """"""""""""
 
-This style is part of the MC package.  It is only enabled if LAMMPS
+This pair style is part of the MC package.  It is only enabled if LAMMPS
-was built with that package.  See the :doc:`Build package <Build_package>` page for more info.
+was built with that package.  See the :doc:`Build package
+<Build_package>` page for more info.
+
+This pair style requires an :doc:`atom style <atom_style>` with per
+atom type masses.
 
 Related commands
 """"""""""""""""