diff --git a/README.md b/README.md
index f5e8abf..a8eb96b 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ DYSESSION = {
 | DYNAMODB_REGION      | ap-northeast-1 | The region of the DynamoDB table                                                                                                                                                                                                                          |
 | LOGGING              | Dict           | Configuration of Logging                                                                                                                                                                                                                                  |
 | LOGGING["TYPE"]      | CONSOLE        | Only accept two kinds of parameters: `CONSOLE`, `FILE`. If this set to `CONSOLE`, django-dysession will use `StreamHandler` to stream to the console. If this set to `FILE`, django-dysession will use `FileHandler` to stream to `LOGGING["FILE_PATH"]`. |
-| LOGGING["FILE_PATH"] | session.log    | The file path to save logs of session managements.                                                                                                                                                                                                        |
+| LOGGING["FILE_PATH"] | session.log    | Optional. Only use this configuration when LOGGING["TYPE"] is set to `FILE`. The file path to save logs of session managements.                                                                                                                           |
 
 
 ## Logging
diff --git a/dysession/backends/db.py b/dysession/backends/db.py
index 8a57f46..6860b3a 100644
--- a/dysession/backends/db.py
+++ b/dysession/backends/db.py
@@ -58,7 +58,7 @@ def _get_session(self, no_load=False) -> SessionDataModel:
     def key_salt(self):
         return "dysession.backends." + self.__class__.__qualname__
 
-    def is_empty(self):
+    def is_empty(self) -> bool:
         "Return True when there is no session_key and the session is empty."
         try:
             return not self._session_key and not self._session_cache.is_empty
@@ -69,10 +69,10 @@ def clear(self):
         super().clear()
         self._session_cache = SessionDataModel()
 
-    def items(self):
+    def items(self) -> Dict[str, Any]:
         return self._session.items()
 
-    def __str__(self):
+    def __str__(self) -> str:
         return str(self._get_session())
 
     # Methods that subclass must implement
@@ -124,7 +124,6 @@ def delete(self, session_key=None):
         if session_key is None:
             session_key = self._session_key
 
-        
         try:
             self.db.delete(self._get_session())
         except DeleteSessionError:
diff --git a/dysession/backends/model.py b/dysession/backends/model.py
index 261ca6f..a3a1309 100644
--- a/dysession/backends/model.py
+++ b/dysession/backends/model.py
@@ -48,12 +48,12 @@ def __delitem__(self, key):
     def __iter__(self):
         return iter(self.__variables_names)
 
-    def __is_empty(self):
+    def __is_empty(self) -> bool:
         return len(self.__variables_names) == 0
 
     is_empty = property(__is_empty)
 
-    def get(self, key, default=...):
+    def get(self, key, default=...) -> Any:
         try:
             return self[key]
         except AttributeError:
@@ -61,7 +61,7 @@ def get(self, key, default=...):
                 raise
             return default
 
-    def pop(self, key, default=...):
+    def pop(self, key, default=...) -> Any:
         try:
             ret = self[key]
             del self[key]
diff --git a/dysession/logger/__init__.py b/dysession/logger/__init__.py
index 334b77c..60863c6 100644
--- a/dysession/logger/__init__.py
+++ b/dysession/logger/__init__.py
@@ -10,6 +10,7 @@
 
 
 class LoggingType(Enum):
+    """Enum of python logger type."""
 
     PLAINTEXT_CONSOLE = auto()
     COLOR_CONSOLE = auto()
diff --git a/dysession/logger/handler/colorful_console.py b/dysession/logger/handler/colorful_console.py
index 1139523..298e981 100644
--- a/dysession/logger/handler/colorful_console.py
+++ b/dysession/logger/handler/colorful_console.py
@@ -1,8 +1,9 @@
 import logging
+from typing import Dict
 
 from .ansi import ANSIColor
 
-LOGLEVEL_TRANSFORM = {
+LOGLEVEL_TRANSFORM: Dict[int, str] = {
     logging.DEBUG: ANSIColor.DEBUG.value,
     logging.INFO: ANSIColor.OKCYAN.value,
     logging.WARNING: ANSIColor.WARNING.value,
diff --git a/dysession/settings.py b/dysession/settings.py
index d255252..4dcbb7e 100644
--- a/dysession/settings.py
+++ b/dysession/settings.py
@@ -29,6 +29,9 @@ def get_config() -> Dict[str, Union[str, int]]:
         * TTL_ATTRIBUTE_NAME
         * CACHE_PERIOD
         * DYNAMODB_REGION
+        * LOGGING
+            * TYPE
+            * FILE_PATH
 
     Returns:
         Dict[str, Union[str, int]]
diff --git a/dysession/version.txt b/dysession/version.txt
index 1cc5f65..8cfbc90 100644
--- a/dysession/version.txt
+++ b/dysession/version.txt
@@ -1 +1 @@
-1.1.0
\ No newline at end of file
+1.1.1
\ No newline at end of file