diff --git a/iterators/timeout_iterator.py b/iterators/timeout_iterator.py
index d6f760e4b..38d10831c 100644
--- a/iterators/timeout_iterator.py
+++ b/iterators/timeout_iterator.py
@@ -61,7 +61,7 @@ def __next__(self):
         yield the result from iterator
         if timeout > 0:
             yield data if available.
-            otherwise yield sentinal
+            otherwise yield sentinel
         """
         if self._done:
             raise StopIteration