2 files changed, 2 insertions, 0 deletions

diff --git a/libmat/mutagenstripper.py b/libmat/mutagenstripper.py
index 7e4beed..0f9520a 100644
--- a/libmat/mutagenstripper.py
+++ b/libmat/mutagenstripper.py
@@ -12,6 +12,7 @@ class MutagenStripper(parser.GenericParser):
         self._create_mfile()
 
     def _create_mfile(self):
+        """ This method must be overrriden to instanciate the `mfile` attribute."""
         raise NotImplementedError
 
     def is_clean(self):
diff --git a/libmat/parser.py b/libmat/parser.py
index 23cad6b..8e10ae9 100644
--- a/libmat/parser.py
+++ b/libmat/parser.py
@@ -54,6 +54,7 @@ class GenericParser(object):
         return True
 
     def _is_clean(self, fieldset):
+        """ Helper method of the `is_clean` one """
         for field in fieldset:
             remove = self._should_remove(field)
             if remove is True: