diff --git a/changes/changelog.d/1624.doc b/changes/changelog.d/1624.doc
new file mode 100644
index 000000000..140fa25c6
--- /dev/null
+++ b/changes/changelog.d/1624.doc
@@ -0,0 +1 @@
+Documented the `NGINX_MAX_BODY_SIZE` .env variable (#1624).
diff --git a/docs/administrator_documentation/configuration_docs/env_file.md b/docs/administrator_documentation/configuration_docs/env_file.md
index 8df4c3db5..781be0608 100644
--- a/docs/administrator_documentation/configuration_docs/env_file.md
+++ b/docs/administrator_documentation/configuration_docs/env_file.md
@@ -105,6 +105,13 @@ See {doc}`/administrator_documentation/configuration_docs/ldap` for more informa
    :annotation: = nginx
 .. autodata:: config.settings.common.PROTECT_FILES_PATH
    :annotation: = /_protected
+.. py:data:: NGINX_MAX_BODY_SIZE
+   :value: 100M
+
+   Controls the maximum size of file that users can upload.
+
+   .. note::
+      You can control how much total storage a user can access with the :term:`Upload Quota` setting.
 
 ```