diff --git a/django/conf/locale/ja/formats.py b/django/conf/locale/ja/formats.py
index aaf5f9838f1..c0554d9f618 100644
--- a/django/conf/locale/ja/formats.py
+++ b/django/conf/locale/ja/formats.py
@@ -18,4 +18,4 @@ SHORT_DATETIME_FORMAT = "Y/m/d G:i"
 # DATETIME_INPUT_FORMATS =
 DECIMAL_SEPARATOR = "."
 THOUSAND_SEPARATOR = ","
-# NUMBER_GROUPING =
+NUMBER_GROUPING = 3