diff --git a/py-polars/polars/series/series.py b/py-polars/polars/series/series.py
index ee6734f6c42f..4a9ebf751240 100644
--- a/py-polars/polars/series/series.py
+++ b/py-polars/polars/series/series.py
@@ -2902,7 +2902,7 @@ def chunk_lengths(self) -> list[int]:
 
         Concatenate Series with rechunk = True
 
-        >>> pl.concat([s, s2]).chunk_lengths()
+        >>> pl.concat([s, s2], rechunk=True).chunk_lengths()
         [6]
 
         Concatenate Series with rechunk = False