diff --git a/libmat2/parser_factory.py b/libmat2/parser_factory.py
index 8bca081..621640b 100644
--- a/libmat2/parser_factory.py
+++ b/libmat2/parser_factory.py
@@ -33,6 +33,7 @@ def _get_parsers() -> List[T]:
 
 
 def get_parser(filename: str) -> Tuple[Optional[T], Optional[str]]:
+    """ Return the appropriate parser for a giver filename. """
     mtype, _ = mimetypes.guess_type(filename)
 
     _, extension = os.path.splitext(filename)
diff --git a/mat2 b/mat2
index a49b110..6c23836 100755
--- a/mat2
+++ b/mat2
@@ -96,7 +96,7 @@ def show_parsers():
         for mtype in parser.mimetypes:
             extensions = set()
             for extension in mimetypes.guess_all_extensions(mtype):
-                if extension[1:] not in UNSUPPORTED_EXTENSIONS:  # skip the dot
+                if extension not in UNSUPPORTED_EXTENSIONS:
                     extensions.add(extension)
             if not extensions:
                 # we're not supporting a single extension in the current