diff --git a/reactivex/observable/observable.py b/reactivex/observable/observable.py
index b32e237e..5e69d94c 100644
--- a/reactivex/observable/observable.py
+++ b/reactivex/observable/observable.py
@@ -88,7 +88,7 @@ def subscribe(
 
         Returns:
             Disposable object representing an observer's subscription to
-            the observable sequence.
+            the observable sequence. Call :code:`.dispose()` on it to unsubscribe.
         """
         if (
             isinstance(on_next, abc.ObserverBase)