diff --git a/classes/callbacks.py b/classes/callbacks.py
index 0093c9b..4b111be 100644
--- a/classes/callbacks.py
+++ b/classes/callbacks.py
@@ -10,7 +10,7 @@ class CallbackLanguage:
     language: str
 
     @classmethod
-    def from_callback(cls, callback: CallbackQuery):
+    def from_callback(cls, callback: CallbackQuery) -> "CallbackLanguage":
         """Parse callback query and extract language data from it.
 
         ### Args:
diff --git a/classes/garbage_entry.py b/classes/garbage_entry.py
index 7c97b60..644c305 100644
--- a/classes/garbage_entry.py
+++ b/classes/garbage_entry.py
@@ -23,7 +23,7 @@ class GarbageEntry:
     date: datetime
 
     @classmethod
-    async def from_dict(cls, data: Mapping[str, Any]):
+    async def from_dict(cls, data: Mapping[str, Any]) -> "GarbageEntry":
         """Generate GarbageEntry object from the mapping provided
 
         ### Args:
@@ -60,7 +60,7 @@ class GarbageEntry:
         )
 
     @classmethod
-    async def from_record(cls, data: Mapping[str, Any]):
+    async def from_record(cls, data: Mapping[str, Any]) -> "GarbageEntry":
         locations = [
             await Location.get(location_id) for location_id in data["locations"]
         ]
diff --git a/classes/location.py b/classes/location.py
index 5a29557..57497a3 100644
--- a/classes/location.py
+++ b/classes/location.py
@@ -28,7 +28,7 @@ class Location:
     timezone: Union[BaseTzInfo, DstTzInfo]
 
     @classmethod
-    async def get(cls, id: int):
+    async def get(cls, id: int) -> "Location":
         db_entry = await col_locations.find_one({"id": id})
 
         if db_entry is None:
@@ -40,7 +40,7 @@ class Location:
         return cls(**db_entry)
 
     @classmethod
-    async def find(cls, name: str):
+    async def find(cls, name: str) -> "Location":
         db_entry = await col_locations.find_one({"name": {"$regex": name}})
 
         if db_entry is None:
@@ -52,7 +52,7 @@ class Location:
         return cls(**db_entry)
 
     @classmethod
-    async def nearby(cls, lat: float, lon: float):
+    async def nearby(cls, lat: float, lon: float) -> "Location":
         db_entry = await col_locations.find_one({"location": {"$near": [lon, lat]}})
 
         if db_entry is None: