diff --git a/doc/guide/transport.rst b/doc/guide/transport.rst
index 0ef2e244..4f98f930 100644
--- a/doc/guide/transport.rst
+++ b/doc/guide/transport.rst
@@ -1,6 +1,6 @@
 .. _Transport:
 
-Transport calculations
+Transport calculations test
 ======================
 
 Formalism
@@ -65,7 +65,10 @@ The basics steps to calculate the matrix elements of the momentum operator with
     6) Run `x optic`. 
 
 Additionally the input file :file:`case.inop` is required. A detail description on how to setup this file can be found in the Wien2k user guide [#userguide]_ on page 166.
-Here the energy window can be chosen according to the window used for :program:`dmftproj`. However, keep in mind that energies have to be specified in absolute values! Furthermore it is important to set line 6 to "ON" and a "1" in the next line for printing the matrix elements to the :file:`.pmat` file.
+The optics energy window should be chosen according to the window used for :program:`dmftproj`. Note that the current version of the transport code uses only the smaller
+of those two windows. However, keep in mind that the optics energy window has to be specified in absolute values and NOT relative to the Fermi energy! 
+You can read off the Fermi energy from the :file:`case.scf2` file. Please do not set the optional parameter NBvalMAX in :file:`case.inop`.
+Furthermore it is necessary to set line 6 to "ON" and put a "1" in the following line to enable the printing of the matrix elements to :file:`case.pmat`.
 
 
 Using the transport code