diff --git a/src/bot/handlers/callbacks/__init__.py b/src/bot/handlers/callbacks/__init__.py
index a9a2c5b..fa969e2 100644
--- a/src/bot/handlers/callbacks/__init__.py
+++ b/src/bot/handlers/callbacks/__init__.py
@@ -1 +1,4 @@
 __all__ = []
+
+
+# TODO: Add automatic import all modules from this folder.
diff --git a/src/bot/handlers/commands/__init__.py b/src/bot/handlers/commands/__init__.py
index 897cbe5..5e9d7fa 100644
--- a/src/bot/handlers/commands/__init__.py
+++ b/src/bot/handlers/commands/__init__.py
@@ -1,6 +1,8 @@
 __all__ = []
 
 
+# TODO: Add automatic import all modules from this folder.
+
 from aiogram.types import Message
 
 from bot.handlers import registry
diff --git a/src/config/utils.py b/src/config/utils.py
index 884006d..c944472 100644
--- a/src/config/utils.py
+++ b/src/config/utils.py
@@ -8,7 +8,42 @@ from pydantic import Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
+# Constant paths for project.
+LOG_DIR = Path("logs")
+LOG_DIR.mkdir(parents=True, exist_ok=True)
+
+# Log format for loguru logger.
+LOG_FORMAT = (
+    "<green>{time:YYYY-MM-DD HH:mm:ss}</green> | "
+    "<level>{level:<8}</level> | "
+    "<cyan>{process}</cyan>.<cyan>{thread.name}</cyan> | "
+    "<magenta>{module}.{function}:{line}</magenta> – "
+    "<level>{message}</level>"
+)
+
+
 class Settings(BaseSettings):
+    """
+    Class to specify env settings for the project.
+
+    The .env file is located in the project root.
+
+    Env Vars:
+        bot_token (str):
+         Telegram API bot token.
+        listen_logging (bool):
+         intercepting logs from logging.
+         Defaults to False.
+        file_log_level (Literal):
+         logging level for the .log file.
+         "DEBUG", "INFO", "WARNING" or "ERROR".
+         Defaults to "DEBUG".
+        console_log_level (Literal):
+         logging level for the console.
+         "DEBUG", "INFO", "WARNING" or "ERROR".
+         Defaults to "INFO".
+    """
+
     bot_token: str = Field(frozen=True)
 
     listen_logging: bool = Field(
@@ -43,20 +78,18 @@ class Settings(BaseSettings):
     )
 
 
-LOG_DIR = Path("logs")
-LOG_DIR.mkdir(parents=True, exist_ok=True)
-
-LOG_FORMAT = (
-    "<green>{time:YYYY-MM-DD HH:mm:ss}</green> | "
-    "<level>{level:<8}</level> | "
-    "<cyan>{process}</cyan>.<cyan>{thread.name}</cyan> | "
-    "<magenta>{module}.{function}:{line}</magenta> – "
-    "<level>{message}</level>"
-)
-
-
 class InterceptHandler(logging.Handler):
+    """
+    Class for intercepting logs from logging, including Aiogram.
+    """
+
     def emit(self, record: logging.LogRecord) -> None:
+        """
+        Try to intercepting logs from logging.
+
+        Args:
+            record (logging.LogRecord): record from logging.
+        """
         try:
             level = loguru_logger.level(record.levelname).name
         except ValueError:
@@ -82,6 +115,14 @@ def configure_logger(
     listen_logging: bool,
     console_log_level: str,
 ) -> None:
+    """
+    Configure loguru logger.
+
+    Args:
+        file_log_level (str): logging level for the .log file.
+        listen_logging (bool): intercepting logs from logging.
+        console_log_level (str): logging level for the console.
+    """
     if listen_logging:
         logging.root.handlers.clear()
         logging.root.setLevel(logging.DEBUG)
diff --git a/src/database/models.py b/src/database/models.py
index e69de29..c855580 100644
--- a/src/database/models.py
+++ b/src/database/models.py
@@ -0,0 +1 @@
+# TODO: Add database models.
diff --git a/src/database/session.py b/src/database/session.py
index 7431e3b..abdcd2d 100644
--- a/src/database/session.py
+++ b/src/database/session.py
@@ -1,3 +1,4 @@
 from sqlalchemy.ext.asyncio import AsyncSession
 
+# TODO: Add database session.
 session: AsyncSession = ...
diff --git a/src/redis_client/__init__.py b/src/redis_client/__init__.py
index 4c9e398..c020937 100644
--- a/src/redis_client/__init__.py
+++ b/src/redis_client/__init__.py
@@ -3,4 +3,5 @@ __all__ = ["client"]
 
 from redis.asyncio.client import Redis
 
+# TODO: Add redis client.
 client: Redis = ...