diff --git a/README.md b/README.md
index 65fde3d..1abfdd8 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ This pipeline extracts features of a given audio file using a VGGish model imple
 **Input Arguments:**
 
 - filepath:
-  - the input audio
+  - the input audio in `.wav`
   - supported types: `str` (path to the audio)
 
 **Pipeline Output:**