diff --git a/toargridding/static_metadata.py b/toargridding/static_metadata.py
index 313358191d851ad81554b710fe925ffc37204516..66e3f28062be193d682a54dd8b3577c80280f1ae 100644
--- a/toargridding/static_metadata.py
+++ b/toargridding/static_metadata.py
@@ -8,14 +8,25 @@ GLOABAL_CF_ATTRIBUTES_PATH = STATIC_METADATA_PATH / "global_cf_attributes.json"
 
 
 def load_global_cf_attributes():
+    """loading of global 
+
+    Loads global metadata like details on the TOAD DB, license, and CF convention.
+    """
     with open(GLOABAL_CF_ATTRIBUTES_PATH, "r") as f:
         return json.load(f)
 
 
 @dataclass
 class TOARVariable:
-    vars = None
+    """access to available variables of the TOAR database.
+
+    This class knows of all variables of the TOAR database supported by this module.
+    An instance allows direct access to the properties and metadata according to CF of this variable.
+    """
 
+    vars = None
+    """available TOAR variables."""
+    
     name: str
     longname: str
     displayname: str
@@ -26,6 +37,10 @@ class TOARVariable:
 
     @classmethod
     def load_toar_variables(cls) -> list["TOARVariable"]:
+        """load available variables 
+        
+        Is executed by loading the TOARVariable class
+        """
         with open(TOAR_VARIABLES_METADATA_PATH, "r") as f:
             variables = json.load(f)
 
@@ -33,6 +48,10 @@ class TOARVariable:
 
     @classmethod
     def get(cls, standart_name: str) -> "TOARVariable":
+        """searches the known variables for the requested variable
+
+        return: provides direct access to the meta data of the selected variable
+        """
         for var in cls.vars:
             if var.standart_name == standart_name:
                 return var
@@ -41,14 +60,20 @@ class TOARVariable:
 
     @property
     def toar_id(self):
+        """get toar ID; same as id
+        """
         return self.id
 
     @property
     def standart_name(self):
+        """alias to get cf_standardname
+        """
         return self.cf_standardname
 
     @property
     def long_name(self):
+        """alias to get longname
+        """
         return self.longname