diff --git a/Testing.md b/Testing.md
index 40ee12f..700edc7 100644
--- a/Testing.md
+++ b/Testing.md
@@ -171,7 +171,10 @@
 * [WIP cunlink own mailbox containing messages then export messages](unlink-own-mailbox-containing-messages-then-export-messages)
 * [Mailbox wiping complete screen](mailbox-wiping-complete-screen)
 
-  
+### Mailbox device system clock out of sync
+
+* [Mailbox device system clock in the past](mailbox-system-clock-in-the-past)
+* [Mailbox device system clock in the future](mailbox-system-clock-in-the-future)
 
 ### Contact management