diff --git a/docs/config.md b/docs/config.md
index 39855dc..8a482e3 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -17,8 +17,8 @@
 - `strict_ip_checking`: Rejects clients if there is no IP in the `arcade` table for the respective arcade. Default `False`
 ## Title
 - `loglevel`: Logging level for the title server. Default `info`
-- `reboot_start_time`: 24 hour JST time that clients will see as the start of maintenance period, ex `04:00`. Leave blank for no maintenance time. Default: `""`
-- `reboot_end_time`: 24 hour JST time that clients will see as the end of maintenance period, ex `05:00`. Leave blank for no maintenance time. Default: `""`
+- `reboot_start_time`: 24 hour JST time that clients will see as the start of maintenance period, ex `04:00`. A few games or early version will report errors if it is empty, ex maimai DX 1.00
+- `reboot_end_time`: 24 hour JST time that clients will see as the end of maintenance period, ex `07:00`. this must be set to 7:00 am for some game, please do not change it.
 ## Database
 - `host`: Host of the database. Default `localhost`
 - `username`: Username of the account the server should connect to the database with. Default `aime`
diff --git a/example_config/core.yaml b/example_config/core.yaml
index 758a089..daf18fc 100644
--- a/example_config/core.yaml
+++ b/example_config/core.yaml
@@ -18,7 +18,7 @@ server:
 title:
   loglevel: "info"
   reboot_start_time: "04:00"
-  reboot_end_time: "05:00"
+  reboot_end_time: "07:00" # this must be set to 7:00 am for some game, please do not change it
 
 database:
   host: "localhost"