diff --git a/modules/ROOT/pages/scheduler-concept.adoc b/modules/ROOT/pages/scheduler-concept.adoc
index 1b2c83a5ec..7c5209f402 100644
--- a/modules/ROOT/pages/scheduler-concept.adoc
+++ b/modules/ROOT/pages/scheduler-concept.adoc
@@ -238,6 +238,8 @@ The Scheduler component also supports Quartz Scheduler special characters:
 
 //source info: +http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/crontrigger.html+
 
+See https://www.quartz-scheduler.org/api/2.3.0/org/quartz/CronExpression.html[CronExpression] for more information.
+
 This example logs the message "hello" every second:
 
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