diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index ee41d07c52774..04055cd16f106 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -6004,11 +6004,12 @@ def astype(
 
         Parameters
         ----------
-        dtype : data type, or dict of column name -> data type
-            Use a numpy.dtype or Python type to cast entire pandas object to
-            the same type. Alternatively, use {col: dtype, ...}, where col is a
-            column label and dtype is a numpy.dtype or Python type to cast one
-            or more of the DataFrame's columns to column-specific types.
+        dtype : str, data type, Series or Mapping of column name -> data type
+            Use a str, numpy.dtype, pandas.ExtensionDtype or Python type to
+            cast entire pandas object to the same type. Alternatively, use a
+            mapping, e.g. {col: dtype, ...}, where col is a column label and dtype is
+            a numpy.dtype or Python type to cast one or more of the DataFrame's
+            columns to column-specific types.
         copy : bool, default True
             Return a copy when ``copy=True`` (be very careful setting
             ``copy=False`` as changes to values then may propagate to other