diff --git a/scraper/engine.py b/scraper/engine.py
index 8155fbb..2a17abb 100644
--- a/scraper/engine.py
+++ b/scraper/engine.py
@@ -6,7 +6,7 @@
 
 
 class Engine:
-    def __init__(self, url, max_retries, backoff_factor) -> None:
+    def __init__(self, url: str, max_retries: int, backoff_factor: int) -> None:
         self.url = url
         self.request = Request(max_retries=max_retries, backoff_factor=backoff_factor)
 
@@ -28,7 +28,7 @@ def fetch(self, content: str = None) -> pd.DataFrame:
         logger.info(f"Parsed content from {self.url}. Extracted {len(df)} rows.")
         return df
 
-    def get_content(self):
+    def get_content(self) -> str:
         try:
             r = self.request.request("GET", self.url)
             r.raise_for_status()
diff --git a/utils/request_helper.py b/utils/request_helper.py
index 3097fb9..8fbb15e 100644
--- a/utils/request_helper.py
+++ b/utils/request_helper.py
@@ -6,7 +6,7 @@
 
 
 class Request:
-    def __init__(self, max_retries, backoff_factor) -> None:
+    def __init__(self, max_retries: int, backoff_factor: int) -> None:
         self.max_retries = max_retries
         self.backoff_factor = backoff_factor