diff --git a/stl_thumb_generator.lua b/stl_thumb_generator.lua
index 65b4ac1..d75aef8 100644
--- a/stl_thumb_generator.lua
+++ b/stl_thumb_generator.lua
@@ -7,6 +7,7 @@ local function parse_one_level( path )
   for myfile in lfs.dir(path) do
     local attr = lfs.attributes (myfile)
     if attr.mode == "directory" then
+      print("Entering sub folder : ", myfile)
       parse_one_level( myfile)
     elseif string.match(myfile, "%.stl") or string.match(myfile, "%.STL") then
       print("Thumbnail for : ", myfile)