diff --git a/README.md b/README.md
index 69ecea1..e0bec7f 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ This python code create a audio book.mp3 from a pdf file
 # Install
 
 pip install -r requirements.txt  
-put your pdf file in this folder with the name "file.pdf"
+put your pdf file in this folder with the name and extension "file.pdf"  
 python main.py
 
 # Author