diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 1f524d07bfd3a..2fc137a85daaf 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -3349,8 +3349,9 @@ def to_csv(
             sequence should be given if the object uses MultiIndex. If
             False do not print fields for index names. Use index_label=False
             for easier importing in R.
-        mode : str
-            Python write mode, default 'w'.
+        mode : str, default 'w'
+            Python write mode. The available write modes are the same as
+            :py:func:`open`.
         encoding : str, optional
             A string representing the encoding to use in the output file,
             defaults to 'utf-8'. `encoding` is not supported if `path_or_buf`