diff --git a/src/cpl/database/connection/database_connection.py b/src/cpl/database/connection/database_connection.py
index e83f12b2..87f77758 100644
--- a/src/cpl/database/connection/database_connection.py
+++ b/src/cpl/database/connection/database_connection.py
@@ -12,6 +12,10 @@ from cpl.database.database_settings import DatabaseSettings
 class DatabaseConnection(DatabaseConnectionABC):
 
     def __init__(self, database_settings: DatabaseSettings):
+        """
+        Represents an connection to a database
+        :param database_settings:
+        """
         DatabaseConnectionABC.__init__(self)
 
         self._db_settings = database_settings
diff --git a/src/cpl/database/connection/database_connection_abc.py b/src/cpl/database/connection/database_connection_abc.py
index 0e2db3b1..139e9214 100644
--- a/src/cpl/database/connection/database_connection_abc.py
+++ b/src/cpl/database/connection/database_connection_abc.py
@@ -18,4 +18,10 @@ class DatabaseConnectionABC(ABC):
     def session(self) -> Session: pass
 
     @abstractmethod
-    def connect(self, connection_string: str): pass
+    def connect(self, connection_string: str):
+        """
+        Connects to a database by connection string
+        :param connection_string:
+        :return:
+        """
+        pass