diff --git a/docs/en/modules/cron.md b/docs/en/modules/cron.md
index 93798de4..baaa22ac 100644
--- a/docs/en/modules/cron.md
+++ b/docs/en/modules/cron.md
@@ -6,7 +6,7 @@
 [Cron](https://en.wikipedia.org/wiki/Cron)-like scheduler module.
 
 !!! important
-    This module needs RTC time to operate correctly. Do not forget to include the [`rtctime`](rtctime.md) module.
+    This module needs RTC time to operate correctly. Do not forget to include the [`rtctime`](rtctime.md) module **and** initialize it properly.
 
 ## cron.schedule()