diff --git a/gprMax/materials.py b/gprMax/materials.py
index e29abc41..3436c4f5 100644
--- a/gprMax/materials.py
+++ b/gprMax/materials.py
@@ -152,9 +152,9 @@ def process_materials(G):
     if G.messages:
         print('\nMaterials:')
         if Material.maxpoles == 0:
-            materialsdata = [['\nID', '\nName', '\nType', '\neps_r', 'sigma\n[S/m]', '\nmu_r', 'sigma*\n[S/m]', 'Dielectric\nsmoothable']]
+            materialsdata = [['\nID', '\nName', '\nType', '\neps_r', 'sigma\n[S/m]', '\nmu_r', 'sigma*\n[Ohm/m]', 'Dielectric\nsmoothable']]
         else:
-            materialsdata = [['\nID', '\nName', '\nType', '\neps_r', 'sigma\n[S/m]', 'Delta\neps_r', 'tau\n[s]', 'omega\n[Hz]', 'delta\n[Hz]', 'gamma\n[Hz]', '\nmu_r', 'sigma*\n[S/m]', 'Dielectric\nsmoothable']]
+            materialsdata = [['\nID', '\nName', '\nType', '\neps_r', 'sigma\n[S/m]', 'Delta\neps_r', 'tau\n[s]', 'omega\n[Hz]', 'delta\n[Hz]', 'gamma\n[Hz]', '\nmu_r', 'sigma*\n[Ohm/m]', 'Dielectric\nsmoothable']]
 
     for material in G.materials:
         # Calculate update coefficients for material