diff --git a/ps/__init__.py b/ps/__init__.py
index 2290983..6502b21 100644
--- a/ps/__init__.py
+++ b/ps/__init__.py
@@ -4,7 +4,7 @@ import txt
 
 
 def get_tuples_args(tuples) -> list[str]:
-    args = []
+    args: list[str] = []
     for item in tuples:
         if type(item) is tuple:
             args.extend(item)