DOC: Document optional keyword parameters

Author: dahlbaek

pandas/core/series.py

@@ -2917,6 +2917,9 @@ def to_csv(self, path_or_buf=None, index=True, sep=",", na_rep='',
         decimal: string, default '.'
             Character recognized as decimal separator. E.g. use ',' for
             European data
+        kwargs
+            Additional keyword arguments are passed to
+            :func:`pandas.DataFrame.to_csv`
         """
         from pandas.core.frame import DataFrame
         df = DataFrame(self)