diff --git a/API.md b/API.md
index 39b6faf2..e6b3d750 100644
--- a/API.md
+++ b/API.md
@@ -1313,6 +1313,7 @@ Required parameters:
     None
 
 Optional parameters:
+    grouping (int):         0 or 1
     time_range (str):       The number of days of data to return
     y_axis (str):           "plays" or "duration"
     user_id (str):          The user id to filter the data
diff --git a/plexpy/webserve.py b/plexpy/webserve.py
index 3f54c72e..f283d9b9 100644
--- a/plexpy/webserve.py
+++ b/plexpy/webserve.py
@@ -1807,6 +1807,7 @@ class WebInterface(object):
                 None
 
             Optional parameters:
+                grouping (int):         0 or 1
                 time_range (str):       The number of days of data to return
                 y_axis (str):           "plays" or "duration"
                 user_id (str):          The user id to filter the data