Reverted text in line 168

Docs/sphinx/manual/Model.rst

@@ -165,7 +165,7 @@ where :math:`\overline \theta` and :math:`\overline S` are the mean values of :m
 
     \int_V \nabla \cdot \boldsymbol{u} dV + \int_V (\overline \theta + \delta \theta)\frac{dp_0}{dt} dV = \int_V (\overline S + \delta S) dV
 
-Since the perturbations integrate to zero over the domain volume, the mean values are constants, and :math:`p_0` is only a function of time, the above simplifies:
+Since the perturbations integrate to zero over the domain volume, the mean values are constants, and :math:`p_0` is only a function of time, the above simplifies to:
 
 .. math::