diff --git a/doc/src/fix_nh.rst b/doc/src/fix_nh.rst
index a02ff3ae99..6f394dfa8d 100755
--- a/doc/src/fix_nh.rst
+++ b/doc/src/fix_nh.rst
@@ -214,23 +214,23 @@ The relaxation rate of the barostat is set by its inertia :math:`W`:
 
 .. math::
 
-   W = (N + 1) k T_{target} P_{damp}^2
+   W = (N + 1) k T_{\rm target} P_{\rm damp}^2
+  
+where :math:`N` is the number of atoms, :math:`k` is the Boltzmann constant, 
+and :math:`T_{\rm target}` is the target temperature of the barostat :ref:`(Martyna) <nh-Martyna>`. 
+If a thermostat is defined, :math:`T_{\rm target}` is the target temperature 
+of the thermostat. If a thermostat is not defined, :math:`T_{\rm target}` 
+is set to the current temperature of the system when the barostat is initialized. 
+If this temperature is too low the simulation will quit with an error. 
+Note: in previous versions of LAMMPS, :math:`T_{\rm target}` would default to 
+a value of 1.0 for *lj* units and 300.0 otherwise if the system had a temperature 
+of exactly zero. 
 
-where :math:`N` is the number of atoms, :math:`k` is the Boltzmann constant,
-and :math:`T_{target}` is the target temperature of the barostat :ref:`(Martyna) <nh-Martyna>`.
-If a thermostat is defined, :math:`T_{target}` is the target temperature
-of the thermostat. If a thermostat is not defined, :math:`T_{target}`
-is set to the current temperature of the system when the barostat is initialized.
-If this temperature is too low the simulation will quit with an error.
-Note: in previous versions of LAMMPS, :math:`T_{target}` would default to
-a value of 1.0 for *lj* units and 300.0 otherwise if the system had a temperature
-of exactly zero.
-
-If a thermostat is not specified by this fix, :math:`T_{target}` can be
-manually specified using the *Ptemp* parameter. This may be useful if the
-barostat is initialized when the current temperature does not reflect the
-steady state temperature of the system. This keyword may also be useful in
-athermal simulations where the temperature is not well defined.
+If a thermostat is not specified by this fix, :math:`T_{\rm target}` can be 
+manually specified using the *Ptemp* parameter. This may be useful if the 
+barostat is initialized when the current temperature does not reflect the 
+steady state temperature of the system. This keyword may also be useful in 
+athermal simulations where the temperature is not well defined. 
 
 Regardless of what atoms are in the fix group (the only atoms which
 are time integrated), a global pressure or stress tensor is computed