diff --git a/doc/fix_drag.html b/doc/fix_drag.html
index d1136a624..879796263 100644
--- a/doc/fix_drag.html
+++ b/doc/fix_drag.html
@@ -1,60 +1,64 @@
<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 drag command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix ID group-ID drag x y z fmag delta
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
<LI>drag = style name of this fix command
<LI>x,y,z = coord to drag atoms towards
<LI>fmag = magnitude of force to apply to each atom (force units)
<LI>delta = cutoff distance inside of which force is not applied (distance units)
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0
</PRE>
<P><B>Description:</B>
</P>
<P>Apply a force to each atom in a group to drag it towards the point
(x,y,z). The magnitude of the force is specified by fmag. If an atom
is closer than a distance delta to the point, then the force is not
applied.
</P>
<P>Any of the x,y,z values can be specified as NULL which means do not
include that dimension in the distance calculation or force
application.
</P>
<P>This command can be used to steer one or more atoms to a new location
in the simulation.
</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>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
-are relevant to this fix. No global scalar or vector or per-atom
-quantities are stored by this fix for access by various <A HREF = "Section_howto.html#4_15">output
-commands</A>. No parameter of this fix can be
-used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
-This fix is not invoked during <A HREF = "minimize.html">energy minimization</A>.
+are relevant to this fix.
+</P>
+<P>This fix computes a 3-vector of forces, which can be accessed by
+various <A HREF = "Section_howto.html#4_15">output commands</A>. This is the total
+force on the group of atoms by the drag force.
+</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. This fix is not invoked during <A HREF = "minimize.html">energy
+minimization</A>.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_spring.html">fix spring</A>
</P>
<P><B>Default:</B> none
</P>
</HTML>
diff --git a/doc/fix_drag.txt b/doc/fix_drag.txt
index 57267d8c1..4b2d60a8e 100644
--- a/doc/fix_drag.txt
+++ b/doc/fix_drag.txt
@@ -1,56 +1,60 @@
"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 drag command :h3
[Syntax:]
fix ID group-ID drag x y z fmag delta :pre
ID, group-ID are documented in "fix"_fix.html command
drag = style name of this fix command
x,y,z = coord to drag atoms towards
fmag = magnitude of force to apply to each atom (force units)
delta = cutoff distance inside of which force \
is not applied (distance units) :ul
[Examples:]
fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0 :pre
[Description:]
Apply a force to each atom in a group to drag it towards the point
(x,y,z). The magnitude of the force is specified by fmag. If an atom
is closer than a distance delta to the point, then the force is not
applied.
Any of the x,y,z values can be specified as NULL which means do not
include that dimension in the distance calculation or force
application.
This command can be used to steer one or more atoms to a new location
in the simulation.
[Restart, fix_modify, output, run start/stop, minimize info:]
No information about this fix is written to "binary restart
files"_restart.html. None of the "fix_modify"_fix_modify.html options
-are relevant to this fix. No global scalar or vector or per-atom
-quantities are stored by this fix for access by various "output
-commands"_Section_howto.html#4_15. No parameter of this fix can be
-used with the {start/stop} keywords of the "run"_run.html command.
-This fix is not invoked during "energy minimization"_minimize.html.
+are relevant to this fix.
+
+This fix computes a 3-vector of forces, which can be accessed by
+various "output commands"_Section_howto.html#4_15. This is the total
+force on the group of atoms by the drag force.
+
+No parameter of this fix can be used with the {start/stop} keywords of
+the "run"_run.html command. This fix is not invoked during "energy
+minimization"_minimize.html.
[Restrictions:] none
[Related commands:]
"fix spring"_fix_spring.html
[Default:] none