diff --git a/docs/source/methods/index.rst b/docs/source/methods/index.rst
index 85e4229d2..947c4b9a1 100644
--- a/docs/source/methods/index.rst
+++ b/docs/source/methods/index.rst
@@ -7,3 +7,22 @@ Methodology
 The OpenMC code solves the neutron transport equation using the Monte Carlo
 method whereby particles are tracked as they randomly move through a geometry,
 undergoing collisions, and creating secondary particles.
+
+-------------------
+Reflective Surfaces
+-------------------
+
+In general, a surface can be written in the form :math:`f(x,y,z) = 0`. If a
+neutron is traveling in direction :math:`\vec{v}` and crosses a reflective
+surface of the above form, it can be shown that the velocity vector will then
+become
+
+.. math::
+
+    \mathbf{v'} = \mathbf{v} - 2 (\mathbf{v} \cdot \hat{\mathbf{n}})
+    \hat{\mathbf{n}}
+
+where :math:`\hat{\mathbf{n}}` is a unit vector normal to the surface at the
+point of the surface crossing. The direction of the surface normal will be the
+gradient to the surface at the point of crossing, i.e. :math:`\mathbf{n} =
+\nabla f(x,y,z)`.
diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst
index 917a834e5..96e7499cc 100644
--- a/docs/source/usersguide/input.rst
+++ b/docs/source/usersguide/input.rst
@@ -50,40 +50,40 @@ Geometry Specification -- geometry.xml
 
 Types of surfaces:
 
-x-plane
-  A plane perpendicular to the x axis, i.e. a surface of the form x - x0
-  = 0. The coefficients specified are "x0".
+``x-plane``
+  A plane perpendicular to the x axis, i.e. a surface of the form :math:`x - x_0
+  = 0`. The coefficients specified are ":math:`x_0`".
 
-y-plane
-  A plane perpendicular to the y axis, i.e. a surface of the form y - y0
-  = 0. The coefficients specified are "y0".
+``y-plane``
+  A plane perpendicular to the y axis, i.e. a surface of the form :math:`y - y_0
+  = 0`. The coefficients specified are ":math:`y_0`".
 
-z-plane
-  A plane perpendicular to the z axis, i.e. a surface of the form z - z0
-  = 0. The coefficients specified are "z0".
+``z-plane``
+  A plane perpendicular to the z axis, i.e. a surface of the form :math:`z - z_0
+  = 0`. The coefficients specified are ":math:`z_0`".
 
-plane
-  An arbitrary plane of the form A*x + B*y + C*z = D. The coefficients
-  specified are "A B C D".
+``plane``
+  An arbitrary plane of the form :math:`Ax + By + Cz = D`. The coefficients
+  specified are ":math:`A \: B \: C \: D`".
 
-x-cylinder
+``x-cylinder``
   An infinite cylinder whose length is paralle to the x-axis. This is a
-  quadratic surface of the form (y - y0)^2 + (z - z0)^2 = R^2. The coefficients
-  specified are "y0 z0 R".
+  quadratic surface of the form :math:`(y - y_0)^2 + (z - z_0)^2 = R^2`. The
+  coefficients specified are ":math:`y_0 \: z_0 \: R`".
 
-y-cylinder
+``y-cylinder``
   An infinite cylinder whose length is paralle to the y-axis. This is a
-  quadratic surface of the form (x - x0)^2 + (z - z0)^2 = R^2. The coefficients
-  specified are "x0 z0 R".
+  quadratic surface of the form :math:`(x - x_0)^2 + (z - z_0)^2 = R^2`. The
+  coefficients specified are ":math:`x_0 \: z_0 \: R`".
 
-z-cylinder
+``z-cylinder``
   An infinite cylinder whose length is paralle to the z-axis. This is a
-  quadratic surface of the form (x - x0)^2 + (y - y0)^2 = R^2. The coefficients
-  specified are "x0 y0 R".
+  quadratic surface of the form :math:`(x - x_0)^2 + (y - y_0)^2 = R^2`. The
+  coefficients specified are ":math:`x_0 \: y_0 \: R`".
 
-sphere 
-  A sphere of the form (x - x0)^2 + (y - y0)^2 + (z - z0)^2 = R^2. The
-  coefficients specified are "x0 y0 z0 R".
+``sphere``
+  A sphere of the form :math:`(x - x_0)^2 + (y - y_0)^2 + (z - z_0)^2 =
+  R^2`. The coefficients specified are ":math:`x_0 \: y_0 \: z_0 \: R`".
 
 ----------------------------------------
 Materials Specification -- materials.xml