diff --git a/tiramisu/option.py b/tiramisu/option.py
index eca61e2..df0ef2c 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -161,6 +161,14 @@ class BaseOption(BaseInformation):
         object.__setattr__(self, name, value)
 
     def _impl_convert_consistencies(self, descr, load=False):
+        """during serialization process, many things have to be done.
+        one of them is the localisation of the options.
+        The paths are set once for all.
+
+        :type descr: :class:`tiramisu.option.OptionDescription`
+        :param load: `True` if we are at the init of the option description
+        :type load: bool
+        """
         if not load and self._consistencies is None:
             self._state_consistencies = None
         elif load and self._state_consistencies is None:
@@ -216,6 +224,11 @@ class BaseOption(BaseInformation):
                 self._state_requires = new_value
 
     def _impl_getstate(self, descr):
+        """the under the hood stuff that need to be done
+        before the serialization.
+
+        :param descr: the parent :class:`tiramisu.option.OptionDescription`
+        """
         self._stated = True
         self._impl_convert_consistencies(descr)
         self._impl_convert_requires(descr)
@@ -225,6 +238,14 @@ class BaseOption(BaseInformation):
             pass
 
     def __getstate__(self, stated=True):
+        """special method to enable the serialization with pickle
+        Usualy, a `__getstate__` method does'nt need any parameter,
+        but somme under the hood stuff need to be done before this action
+
+        :parameter stated: if stated is `True`, the serialization protocol
+                           can be performed, not ready yet otherwise
+        :parameter type: bool
+        """
         try:
             self._stated
         except AttributeError:
@@ -1070,8 +1091,12 @@ class OptionDescription(BaseOption):
             option._impl_getstate(descr)
 
     def __getstate__(self):
+        """special method to enable the serialization with pickle
+        """
         stated = True
         try:
+            # the `_state` attribute is a flag that which tells us if
+            # the serialization can be performed
             self._stated
         except AttributeError:
             # if cannot delete, _impl_getstate never launch