diff --git a/docs/source/output.rst b/docs/source/output.rst
index bf4b4300..0480b061 100644
--- a/docs/source/output.rst
+++ b/docs/source/output.rst
@@ -14,20 +14,22 @@ The output file has the following HDF5 attributes at the root (``/``):
 
 * ``Title`` is the title of the model
 * ``Iterations`` is the number of iterations for the time window of the model
+* ``nx, ny, nz`` is a tuple containing the number of cells in each direction of the model
 * ``dx, dy, dz`` is a tuple containing the spatial discretisation, i.e. :math:`\Delta x`, :math:`\Delta y`, :math:`\Delta z`
 * ``dt`` is the time step of the model, i.e. :math:`\Delta t`
 * ``srcsteps`` is the spatial increment used to move all sources between model runs.
 * ``rxsteps`` is the spatial increment used to move all receivers between model runs.
-* ``ntx`` is the total number of sources in the model.
+* ``nsrc`` is the total number of sources in the model.
 * ``nrx`` is the total number of receievers in the model.
 
-The output file contains HDF5 groups for sources (``txs``) and receivers (``rxs``). Within each group are further groups that correspond to individual sources, e.g. ``tx1``, ``tx2`` etc..., and receivers, e.g. ``rx1``, ``rx2`` etc...
+The output file contains HDF5 groups for sources (``srcs``), transmission lines (``tls``), and receivers (``rxs``). Within each group are further groups that correspond to individual sources/transmission lines/receivers, e.g. ``src1``, ``src2`` etc...
 
 .. code-block:: none
 
     /
         rxs/
             rx1/
+                Name [optional]
                 Position
                 Ex
                 Ey
@@ -37,15 +39,25 @@ The output file contains HDF5 groups for sources (``txs``) and receivers (``rxs`
                 Hz
             rx2/
                 ...
-        txs/
-            tx1/
+        srcs/
+            src1/
                 Position
-            tx2/
+            src2/
                 ...
 
+        tls/
+            tl1/
+                Position
+            tl22/
+                ...
+
+Within each individual ``rx`` group are the following attributes:
+
+* ``Name`` is optional if a name for the receiver is given in the model.
+* ``Position`` is the x, y, z position (in metres) of the receiver in the model.
+
 Within each individual ``rx`` group are the following datasets:
 
-* ``Position`` is the x, y, z position (in metres) of the receiver in the model.
 * ``Ex`` is an array containing the time history (for the model time window) of the values of the x component of the electric field at that receiver position.
 * ``Ey`` is an array containing the time history (for the model time window) of the values of the y component of the electric field at that receiver position.
 * ``Ez`` is an array containing the time history (for the model time window) of the values of the z component of the electric field at that receiver position.
@@ -53,9 +65,24 @@ Within each individual ``rx`` group are the following datasets:
 * ``Hy`` is an array containing the time history (for the model time window) of the values of the y component of the magnetic field at that receiver position.
 * ``Hz`` is an array containing the time history (for the model time window) of the values of the z component of the magnetic field at that receiver position.
 
-Within each individual ``tx`` group is the following dataset:
+Within each individual ``src`` group are the following attributes:
 
-* ``Position`` is the x, y, z position (in metres) of the receiver in the model.
+* ``Type`` is the type of source, e.g. Hertzian dipole, voltage source etc...
+* ``Position`` is the x, y, z position (in metres) of the source in the model.
+
+Within each individual ``tl`` group are the following attributes:
+
+* ``Position`` is the x, y, z position (in metres) of the source in the model.
+* ``Resistance`` is the resistance of the transmission line.
+* ``dl`` is the spatial discretisation of the transmission line.
+
+Within each individual ``tl`` group are the following datasets:
+
+* ``Vinc`` is an array containing the time history (for the model time window) of the values of the incident voltage in the transmission line.
+* ``Vscat`` is an array containing the time history (for the model time window) of the values of the scattered (field) voltage in the transmission line.
+* ``Iscat`` is an array containing the time history (for the model time window) of the values of the scattered (field) current in the transmission line.
+* ``Vtot`` is an array containing the time history (for the model time window) of the values of the total (field) voltage in the transmission line.
+* ``Itot`` is an array containing the time history (for the model time window) of the values of the total (field) current in the transmission line.
 
 
 Viewing output