diff --git a/docs/source/userGuide/models/cell/cell.rst b/docs/source/userGuide/models/cell/cell.rst
index 1b57ed26..d2a39c12 100644
--- a/docs/source/userGuide/models/cell/cell.rst
+++ b/docs/source/userGuide/models/cell/cell.rst
@@ -211,7 +211,7 @@ interior and exterior. See the script ``NaCl-cell.py`` and input file ``NaCl.db`
 Example input files for both cases are stored within the LBPM repository, located at ``example/SingleCell/``
 
 
-The membrane simply prevents the diffusion of ions. All lattice links crossing the membrane are stored in a dedicated data structure so that transport is decoupled from the bulk regions. Suppose that site :math:`\mathbf{x}_{q\ell}` is inside the membrane and :math:`\mathbf{x}_{p\ell}` is outside the membrane, with :math:`\mathbf{x}_{p \ell } = \mathbf{x}_{q\ell} + \bm{\xi}_q \Delta t`. For each species :math:`k`, transport across each link :math:`\ell` is controlled by a pair of coefficients, :math:`\alpha^k_{\ell p}` and :math:`\alpha^k_{\ell q}`. Ions transported from the outside to the inside is
+The membrane simply prevents the diffusion of ions. All lattice links crossing the membrane are stored in a dedicated data structure so that transport is decoupled from the bulk regions. Suppose that site :math:`\mathbf{x}_{q\ell}` is inside the membrane and :math:`\mathbf{x}_{p\ell}` is outside the membrane, with :math:`\mathbf{x}_{p \ell } = \mathbf{x}_{q\ell} + \bm{\xi}_q \Delta t`. For each species :math:`k`, transport across each link :math:`\ell` is controlled by a pair of coefficients, :math:`\alpha^k_{\ell p}` and :math:`\alpha^k_{\ell q}`. Ions transported from the outside to the inside are transported by the particular distribution that is associated with the direction :math:`\xi_q`
 
 .. math::
    :nowrap: