diff --git a/check_metadata/checkMetadata/__main__.py b/check_metadata/checkMetadata/__main__.py
index 69ecc3f..4fe94b3 100644
--- a/check_metadata/checkMetadata/__main__.py
+++ b/check_metadata/checkMetadata/__main__.py
@@ -25,7 +25,7 @@ class MediaFile:
     duration: int #in sec
 
 def supported_file_extension(filename):
-    if filename.endswith('.mp4') or filename.endswith('.mkv'):
+    if filename.endswith('.mp4') or filename.endswith('.mkv') or filename.endswith('.webm'):
         return True
     return False