diff --git a/README.md b/README.md
index 54ffec2..69fd4b5 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 Extracts files from one or multiple folders and moves them to the parent folder.
 
+How to use the extension filter:
+Add file extensions into the text field and separate extensions with comma.
+If you didn't write anything or whitespaces the program will extract all files.
+
 TODOS:
-- improve GUI
-- add file filter
\ No newline at end of file
+- improve GUI
\ No newline at end of file