diff --git a/volia/core/env.py b/volia/core/env.py
deleted file mode 100644
index c4a538b..0000000
--- a/volia/core/env.py
+++ /dev/null
@@ -1,90 +0,0 @@
-import json
-
-"""
-This module aims to manage environement variables local to the application.
-These variables are persitent and located in a json file.
-"""
-
-class Env(object):
-    """Initialize with an persistent file (json)
-
-    You can access to environment variables using the brackets operators.
-    You can also check with the 'in' operator if a key is present among
-    the variables.
-    
-    example code:
-    ```
-    env = Env("myfile.json")
-
-    if "MyVariable" in env:
-        print(env["MyVariable"])
-    else:
-        env["MyVariable"] = "New value"
-    ```
-
-    """
-    def __init__(self, file: str):
-        self.__variables = {}
-        self.file = file
-        self.load()
-
-    @property
-    def variables(self):
-        return self.__variables
-
-    @property
-    def file(self):
-        return self.__file
-
-    @file.setter
-    def file(self, file):
-        self.__file = file
-
-
-    def set(self, key: str, value: str):
-        """Modify an environment variable
-
-        Args:
-            key (str): [description]
-            value ([type]): [description]
-        """
-        self.__variables[str]
-        self.save()
-    
-
-    def get(self, key: str) -> str:
-        """Get an environment variable.
-
-        Args:
-            key (str): [description]
-
-        Returns:
-            [str]: [description]
-        """
-        return self.variables[key]
-
-    def __getitem__(self, key):
-        print(key)
-        return self.variables[key]
-
-    def __setitem__(self, key, value):
-        self.variables[key] = value
-
-    def __delitem__(self, key):
-        del self.variables[key]
-
-    def __contains__(self, key):
-        return key in self.variables
-    
-    def load(self):
-        """Load the variables from the json file.
-        """
-        with open(self.file, "r") as f:
-            self.__variables = json.load(f)
-
-
-    def save(self):
-        """Save the variables into the json file.
-        """
-        with open(self.file, "w") as f:
-            json.dump(self.variables, f)
diff --git a/volia/core/persistency.py b/volia/core/persistency.py
new file mode 100644
index 0000000..2c3381c
--- /dev/null
+++ b/volia/core/persistency.py
@@ -0,0 +1,90 @@
+import json
+
+"""
+This module aims to manage environement variables local to the application.
+These variables are persitent and located in a json file.
+"""
+
+class PersistencyData(object):
+    """Initialize with an persistent file (json)
+
+    You can access to environment variables using the brackets operators.
+    You can also check with the 'in' operator if a key is present among
+    the variables.
+    
+    example code:
+    ```
+    env = Env("myfile.json")
+
+    if "MyVariable" in env:
+        print(env["MyVariable"])
+    else:
+        env["MyVariable"] = "New value"
+    ```
+
+    """
+    def __init__(self, file: str):
+        self.__variables = {}
+        self.file = file
+        self.load()
+
+    @property
+    def variables(self):
+        return self.__variables
+
+    @property
+    def file(self):
+        return self.__file
+
+    @file.setter
+    def file(self, file):
+        self.__file = file
+
+
+    def set(self, key: str, value: str):
+        """Modify an environment variable
+
+        Args:
+            key (str): [description]
+            value ([type]): [description]
+        """
+        self.__variables[str]
+        self.save()
+    
+
+    def get(self, key: str) -> str:
+        """Get an environment variable.
+
+        Args:
+            key (str): [description]
+
+        Returns:
+            [str]: [description]
+        """
+        return self.variables[key]
+
+    def __getitem__(self, key):
+        print(key)
+        return self.variables[key]
+
+    def __setitem__(self, key, value):
+        self.variables[key] = value
+
+    def __delitem__(self, key):
+        del self.variables[key]
+
+    def __contains__(self, key):
+        return key in self.variables
+    
+    def load(self):
+        """Load the variables from the json file.
+        """
+        with open(self.file, "r") as f:
+            self.__variables = json.load(f)
+
+
+    def save(self):
+        """Save the variables into the json file.
+        """
+        with open(self.file, "w") as f:
+            json.dump(self.variables, f)