diff --git a/docs/source/FluidEquations.rst b/docs/source/FluidEquations.rst
index 422e06444c6eca20de0571e97e4fb5e3ec4c6b85..63cadd45d415e5951be77f6705eeda780c0c743a 100644
--- a/docs/source/FluidEquations.rst
+++ b/docs/source/FluidEquations.rst
@@ -3,10 +3,16 @@ Fluid Equations
 
 We define the following fluid variables:
 
+where :math:`\rho_g =` 
+
 where :math:`\rho_g = ` fluid density (assumed to be constant in the absence of reactions)
 
+where :math:`\varepsilon_g =` 
+
 where :math:`\varepsilon_g = ` volume fraction of fluid (accounts only for displacement of fluid by particle, does not account for the EB walls)
 
+where :math:`U_g =`
+
 where :math:`U_g = ` fluid velocity
 
 where :math:`p_g = ` fluid pressure