diff --git a/README.md b/README.md
index b386c20..f83d167 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,6 @@ Script to export parts and drawings to production files (part -> step, dxf, pdf)
 
 ## Use:
 
-`.\run.py path\Part1` will generate step, pdf and dxf in path
+`.\run.py path\Part1` (without extension) will generate step, pdf and dxf in path
 
 For multiple files, add them in argument
\ No newline at end of file