diff --git a/pandas/core/groupby/groupby.py b/pandas/core/groupby/groupby.py
index 762a183dd6914..11e8769615470 100644
--- a/pandas/core/groupby/groupby.py
+++ b/pandas/core/groupby/groupby.py
@@ -494,7 +494,7 @@ class providing the base-class of operations.
 
 Parameters
 ----------
-func : function, str, list or dict
+func : function, str, list, dict or None
     Function to use for aggregating the data. If a function, must either
     work when passed a {klass} or when passed to {klass}.apply.
 
@@ -504,6 +504,10 @@ class providing the base-class of operations.
     - string function name
     - list of functions and/or function names, e.g. ``[np.sum, 'mean']``
     - dict of axis labels -> functions, function names or list of such.
+    - None, in which case ``**kwargs`` are used with Named Aggregation. Here the
+      output has one column for each element in ``**kwargs``. The name of the
+      column is keyword, whereas the value determines the aggregation used to compute
+      the values in the column.
 
     Can also accept a Numba JIT function with
     ``engine='numba'`` specified. Only passing a single function is supported
@@ -534,7 +538,9 @@ class providing the base-class of operations.
 
     .. versionadded:: 1.1.0
 **kwargs
-    Keyword arguments to be passed into func.
+    * If ``func`` is None, ``**kwargs`` are used to define the output names and
+      aggregations via Named Aggregation. See ``func`` entry.
+    * Otherwise, keyword arguments to be passed into func.
 
 Returns
 -------
@@ -544,10 +550,10 @@ class providing the base-class of operations.
 --------
 {klass}.groupby.apply : Apply function func group-wise
     and combine the results together.
-{klass}.groupby.transform : Aggregate using one or more
-    operations over the specified axis.
-{klass}.aggregate : Transforms the Series on each group
+{klass}.groupby.transform : Transforms the Series on each group
     based on the given function.
+{klass}.aggregate : Aggregate using one or more
+    operations over the specified axis.
 
 Notes
 -----