diff --git a/pandas/core/algorithms.py b/pandas/core/algorithms.py
index 9b1637fcd824f..796e5c8c6eb91 100644
--- a/pandas/core/algorithms.py
+++ b/pandas/core/algorithms.py
@@ -1451,6 +1451,8 @@ def func(arr, indexer, out, fill_value=np.nan):
 def take(arr, indexer, allow_fill=False, fill_value=None):
     """Take elements from an array.
 
+    .. versionadded:: 0.23.0
+
     Parameters
     ----------
     arr : ndarray or ExtensionArray
diff --git a/pandas/core/dtypes/base.py b/pandas/core/dtypes/base.py
index f6311bdf04f08..9769578885b9c 100644
--- a/pandas/core/dtypes/base.py
+++ b/pandas/core/dtypes/base.py
@@ -96,6 +96,8 @@ def is_dtype(cls, dtype):
 class ExtensionDtype(_DtypeOpsMixin):
     """A custom data type, to be paired with an ExtensionArray.
 
+    .. versionadded:: 0.23.0
+
     Notes
     -----
     The interface includes the following abstract methods that must