diff --git a/src/config.py b/src/config.py
index 7b47664..2ca050a 100644
--- a/src/config.py
+++ b/src/config.py
@@ -4,7 +4,7 @@ from dict_deep import deep_get
 conf = None
 
 
-def read_config(filename):
+def read_config(filename) -> dict:
     with open(filename, 'r') as f:
         global conf
         conf = yaml.safe_load(f)