diff --git a/src/finam/schedule.py b/src/finam/schedule.py
index df7bb661de47551c82815d813c1b9ca4e438e763..56a80c42320c181df2966bf8a3e6301dcbb56380 100644
--- a/src/finam/schedule.py
+++ b/src/finam/schedule.py
@@ -88,7 +88,7 @@ class Composition(Loggable):
         version="0.6",
     )
     def initialize(self):
-        ...
+        """Initialize all modules."""
 
     def __init__(
         self,