diff --git a/dynaphopy/interface/interactive_ui.py b/dynaphopy/interface/interactive_ui.py
index <HASH>..<HASH> 100755
--- a/dynaphopy/interface/interactive_ui.py
+++ b/dynaphopy/interface/interactive_ui.py
@@ -60,7 +60,7 @@ def interactive_interface(calculation, trajectory, args, structure_file):
         screen.addstr(7,45,"Frequency range: "+str(calculation.get_frequency_range()[0])+' - '
                                               +str(calculation.get_frequency_range()[-1])+' THz')
 
-        screen.addstr(8,45,"Spectrum resolution: {0}".format(calculation.parameters.spectrum_resolution))
+        screen.addstr(8,45,"Spectrum resolution: {0} THz".format(calculation.parameters.spectrum_resolution))
         screen.addstr(9,45,"Primitive cell atoms: "+str(trajectory.structure.get_number_of_primitive_atoms()))
         screen.addstr(11,45,"Unit cell atoms: "+str(trajectory.structure.get_number_of_atoms()))
         screen.addstr(12,45,"MD  cell atoms: "+str(trajectory.get_number_of_atoms()))
modifiy the way freequency range is introduced.
Now range indicates the interval limits  (min, max) and an additional option resolution is created to define the resolution of the spectrum