diff --git a/flask_bootstrap/__init__.py b/flask_bootstrap/__init__.py
index a71b8a6..a99e7b4 100644
--- a/flask_bootstrap/__init__.py
+++ b/flask_bootstrap/__init__.py
@@ -1,9 +1,12 @@
 import warnings
+from typing import NoReturn, ParamSpec
 
 from flask import current_app, Blueprint, url_for
 from markupsafe import Markup
 from wtforms import BooleanField, HiddenField
 
+P = ParamSpec('P')
+
 CDN_BASE = 'https://cdn.jsdelivr.net/npm'
 
 
@@ -11,11 +14,11 @@ def is_hidden_field_filter(field):
     return isinstance(field, HiddenField)
 
 
-def raise_helper(message):
+def raise_helper(message: str) -> NoReturn:
     raise RuntimeError(message)
 
 
-def get_table_titles(data, primary_key, primary_key_title):
+def get_table_titles(data: list, primary_key: str, primary_key_title: str) -> list[tuple[str, str]]:
     """Detect and build the table titles tuple from ORM object, currently only support SQLAlchemy.
 
     .. versionadded:: 1.4.0
@@ -285,5 +288,5 @@ class SwitchField(BooleanField):
     .. versionadded:: 2.0.0
     """
 
-    def __init__(self, label=None, **kwargs):
+    def __init__(self, label: str = None, **kwargs: P.kwargs) -> None:
         super().__init__(label, **kwargs)