diff --git a/manual/upgrade/upgrade_notes_for_12.0.x.md b/manual/upgrade/upgrade_notes_for_12.0.x.md
index df344af0..2ab82bba 100644
--- a/manual/upgrade/upgrade_notes_for_12.0.x.md
+++ b/manual/upgrade/upgrade_notes_for_12.0.x.md
@@ -27,7 +27,7 @@ Configuration changes:
 * The password strength level is now calculated by algorithm. The old USER_PASSWORD_MIN_LENGTH, USER_PASSWORD_STRENGTH_LEVEL is removed. Only USER_STRONG_PASSWORD_REQUIRED is still used.
 * ADDITIONAL_APP_BOTTOM_LINKS is removed. Because there is no buttom bar in the navigation side bar now.
 * SERVICE_URL and FILE_SERVER_ROOT are removed. SERVICE_URL will be calculated from SEAFILE_SERVER_PROTOCOL and SEAFILE_SERVER_HOSTNAME in `.env` file.
-
+* `ccnet.conf` is removed. Some of its configuration items are moved from `.env` file, others are read from items in `seafile.conf` with same name.
 
 Other changes: