diff --git a/guessit/rules/__init__.py b/guessit/rules/__init__.py
index dc812db..f9dc455 100644
--- a/guessit/rules/__init__.py
+++ b/guessit/rules/__init__.py
@@ -72,6 +72,9 @@ def rebulk_builder():
     rebulk.rebulk(type_())
 
     def customize_properties(properties):
+        """
+        Customize default rebulk properties
+        """
         count = properties['count']
         del properties['count']
 
diff --git a/guessit/rules/properties/mimetype.py b/guessit/rules/properties/mimetype.py
index 7171eab..c57ada7 100644
--- a/guessit/rules/properties/mimetype.py
+++ b/guessit/rules/properties/mimetype.py
@@ -42,4 +42,7 @@ class Mimetype(CustomRule):
 
     @property
     def properties(self):
+        """
+        Properties for this rule.
+        """
         return {'mimetype': [None]}