diff --git a/doc/fix_wall_lj126.html b/doc/fix_wall_lj126.html
index ac718c8b3..e70816500 100644
--- a/doc/fix_wall_lj126.html
+++ b/doc/fix_wall_lj126.html
@@ -1,111 +1,113 @@
<HTML>
<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
</CENTER>
<HR>
<H3>fix wall/lj126 command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix ID group-ID wall/lj126 style coord epsilon sigma cutoff keyword values ...
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
<LI>wall/lj126 = style name of this fix command
<LI>style = <I>xlo</I> or <I>xhi</I> or <I>ylo</I> or <I>yhi</I> or <I>zlo</I> or <I>zhi</I>
<LI>coord = position of wall
<LI>epsilon = Lennard-Jones epsilon for wall-particle interaction
<LI>sigma = Lennard-Jones sigma for wall-particle interaction
<LI>cutoff = distance from wall at which wall-particle interaction is cut off (distance units)
<LI>one or more keyword/value pairs may be appended
<LI>keyword = <I>vel</I>
<PRE> <I>vel</I> args = v
v = velocity of wall in perpendicular direction (velocity units)
</PRE>
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix wallhi all wall/lj126 xhi 10.0 1.0 1.0 1.12
fix leftwall all wall/lj126 zlo 0.0 1.0 1.0 0.858 vel 1.0
</PRE>
<P><B>Description:</B>
</P>
<P>Bound the simulation domain on one of its faces with a Lennard-Jones
wall that interacts with the atoms in the group. The energy E of
wall-particle interactions is given by the 12-6 potential
</P>
<CENTER><IMG SRC = "Eqs/pair_lj.jpg">
</CENTER>
<P>where <I>r</I> is the distance from the particle to the wall <I>coord</I>, and
epsilon and sigma are the usual LJ parameters. Rc is the cutoff value
specified in the command. This interaction provides a harder, more
repulsive interaction with the wall than the softer 9-3 potential
provided by the <A HREF = "fix_wall_lj93.html">fix wall/lj93</A> command.
</P>
<P>The wall potential is shifted so that the energy of a wall-particle
interaction is 0.0 at the cutoff distance.
</P>
<P>If the <I>vel</I> keyword is specified, the position of wall will move
-during the simulation, based on its initial position (coord) and the
-specified velocity (vel). <I>Xlo</I> or <I>xhi</I> walls move in the x
-direction with whatever sign you give the <I>v</I> argument. Ditto for <I>y</I>
-and <I>z</I> walls. Note that if you do multiple runs, the initial
-position of the wall does not change, so it will continue to move at
-the specified velocity.
+during the simulation, based on its initial position (coord), the
+specified velocity (vel), and the time elapsed since the beginning of
+the simulation. <I>Xlo</I> or <I>xhi</I> walls move in the x direction with
+whatever sign you give the <I>v</I> argument. Ditto for <I>y</I> and <I>z</I> walls.
+See the note below about making the wall move continuously across
+multiple runs.
</P>
<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
</P>
<P>No information about this fix is written to <A HREF = "restart.html">binary restart
files</A>.
</P>
<P>The <A HREF = "fix_modify.html">fix_modify</A> <I>energy</I> option is supported by this
fix to add the energy of interaction between atoms and the wall to the
system's potential energy as part of <A HREF = "thermo_style.html">thermodynamic
output</A>.
</P>
<P>This fix computes a scalar energy and a 3-vector of forces (on the
wall), which can be accessed by various <A HREF = "Section_howto.html#4_15">output
commands</A>. The scalar and vector values
calculated by this fix are "extensive", meaning they scale with the
number of atoms in the simulation.
</P>
-<P>No parameter of this fix can be used with the <I>start/stop</I> keywords of
-the <A HREF = "run.html">run</A> command.
+<P>This fix can change the position of the wall, due to the <I>vel</I>
+keyword, continuously over multiple runs, using the <I>start</I> and <I>stop</I>
+keywords of the <A HREF = "run.html">run</A> command. If you do not do this, the
+wall position will be reset to <I>coord</I> at the beginning of each run.
</P>
<P>The forces due to this fix are imposed during an energy minimization,
invoked by the <A HREF = "minimize.html">minimize</A> command.
</P>
<P>IMPORTANT NOTE: If you want the atom/wall interaction energy to be
included in the total potential energy of the system (the quantity
being minimized), you MUST enable the <A HREF = "fix_modify.html">fix_modify</A>
<I>energy</I> option for this fix.
</P>
<P><B>Restrictions:</B>
</P>
<P>Any dimension (xyz) that has a LJ 12/6 wall must be non-periodic.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_wall_reflect.html">fix wall/reflect</A>, <A HREF = "fix_wall_lj93.html">fix
wall/lj93</A>
</P>
<P><B>Default:</B>
</P>
<P>The option defaults are vel = 0.
</P>
</HTML>
diff --git a/doc/fix_wall_lj126.txt b/doc/fix_wall_lj126.txt
index 13512b9ac..caa809e24 100644
--- a/doc/fix_wall_lj126.txt
+++ b/doc/fix_wall_lj126.txt
@@ -1,96 +1,98 @@
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)
:line
fix wall/lj126 command :h3
[Syntax:]
fix ID group-ID wall/lj126 style coord epsilon sigma cutoff keyword values ... :pre
ID, group-ID are documented in "fix"_fix.html command :ulb,l
wall/lj126 = style name of this fix command :l
style = {xlo} or {xhi} or {ylo} or {yhi} or {zlo} or {zhi} :l
coord = position of wall :l
epsilon = Lennard-Jones epsilon for wall-particle interaction :l
sigma = Lennard-Jones sigma for wall-particle interaction :l
cutoff = distance from wall at which wall-particle interaction is cut off (distance units) :l
one or more keyword/value pairs may be appended :l
keyword = {vel} :l
{vel} args = v
v = velocity of wall in perpendicular direction (velocity units) :pre
:ule
[Examples:]
fix wallhi all wall/lj126 xhi 10.0 1.0 1.0 1.12
fix leftwall all wall/lj126 zlo 0.0 1.0 1.0 0.858 vel 1.0 :pre
[Description:]
Bound the simulation domain on one of its faces with a Lennard-Jones
wall that interacts with the atoms in the group. The energy E of
wall-particle interactions is given by the 12-6 potential
:c,image(Eqs/pair_lj.jpg)
where {r} is the distance from the particle to the wall {coord}, and
epsilon and sigma are the usual LJ parameters. Rc is the cutoff value
specified in the command. This interaction provides a harder, more
repulsive interaction with the wall than the softer 9-3 potential
provided by the "fix wall/lj93"_fix_wall_lj93.html command.
The wall potential is shifted so that the energy of a wall-particle
interaction is 0.0 at the cutoff distance.
If the {vel} keyword is specified, the position of wall will move
-during the simulation, based on its initial position (coord) and the
-specified velocity (vel). {Xlo} or {xhi} walls move in the x
-direction with whatever sign you give the {v} argument. Ditto for {y}
-and {z} walls. Note that if you do multiple runs, the initial
-position of the wall does not change, so it will continue to move at
-the specified velocity.
+during the simulation, based on its initial position (coord), the
+specified velocity (vel), and the time elapsed since the beginning of
+the simulation. {Xlo} or {xhi} walls move in the x direction with
+whatever sign you give the {v} argument. Ditto for {y} and {z} walls.
+See the note below about making the wall move continuously across
+multiple runs.
[Restart, fix_modify, output, run start/stop, minimize info:]
No information about this fix is written to "binary restart
files"_restart.html.
The "fix_modify"_fix_modify.html {energy} option is supported by this
fix to add the energy of interaction between atoms and the wall to the
system's potential energy as part of "thermodynamic
output"_thermo_style.html.
This fix computes a scalar energy and a 3-vector of forces (on the
wall), which can be accessed by various "output
commands"_Section_howto.html#4_15. The scalar and vector values
calculated by this fix are "extensive", meaning they scale with the
number of atoms in the simulation.
-No parameter of this fix can be used with the {start/stop} keywords of
-the "run"_run.html command.
+This fix can change the position of the wall, due to the {vel}
+keyword, continuously over multiple runs, using the {start} and {stop}
+keywords of the "run"_run.html command. If you do not do this, the
+wall position will be reset to {coord} at the beginning of each run.
The forces due to this fix are imposed during an energy minimization,
invoked by the "minimize"_minimize.html command.
IMPORTANT NOTE: If you want the atom/wall interaction energy to be
included in the total potential energy of the system (the quantity
being minimized), you MUST enable the "fix_modify"_fix_modify.html
{energy} option for this fix.
[Restrictions:]
Any dimension (xyz) that has a LJ 12/6 wall must be non-periodic.
[Related commands:]
"fix wall/reflect"_fix_wall_reflect.html, "fix
wall/lj93"_fix_wall_lj93.html
[Default:]
The option defaults are vel = 0.