add version changed

pandas-dev · jreback · Jul 28, 2021 · Dec 3, 2018 · Jan 19, 2019 · Jul 30, 2019
commit 09060c546af9dd3bce09568f80cdbb9f75b98107
diff --git a/doc/source/user_guide/visualization.rst b/doc/source/user_guide/visualization.rst
@@ -324,6 +324,8 @@ The ``by`` keyword can be specified to plot grouped histograms:
 
 In addition, the ``by`` keyword can also be specified in :meth:`DataFrame.plot.hist`.
 
+.. versionchanged:: 1.4.0
+
 .. ipython:: python
 
    data = pd.DataFrame(
@@ -474,7 +476,9 @@ columns:
 
     plt.close("all")
 
-You could also create groupings with :meth:`DataFrame.plot.box`, for instance,
+You could also create groupings with :meth:`DataFrame.plot.box`, for instance:
+
+.. versionchanged:: 1.4.0
 
 .. ipython:: python
    :suppress:

diff --git a/pandas/plotting/_core.py b/pandas/plotting/_core.py
@@ -1271,6 +1271,8 @@ def box(self, by=None, **kwargs):
         You can also generate groupings if you specify the `by` parameter (which
         can take a column name, or a list or tuple of column names):
 
+        .. versionchanged:: 1.4.0
+
         .. plot::
             :context: close-figs