diff --git a/gprMax/input_cmds_geometry.py b/gprMax/input_cmds_geometry.py
index 63691294..c39ab596 100644
--- a/gprMax/input_cmds_geometry.py
+++ b/gprMax/input_cmds_geometry.py
@@ -81,7 +81,7 @@ def process_geometrycmds(geometry, G):
             for material in G.materials:
                 if material.numID >= numexistmaterials:
                     if material.type:
-                        material.type += ', imported'
+                        material.type += ',\nimported'
                     else:
                         material.type = 'imported'