diff --git a/docs/release-notes/4.0.1.md b/docs/release-notes/4.0.1.md
index 35067711c..82b747cef 100644
--- a/docs/release-notes/4.0.1.md
+++ b/docs/release-notes/4.0.1.md
@@ -33,3 +33,7 @@ Serenity stopped using Guice in version 3.9.8. This has no impact on most test s
 ```java
 EnvironmentVariables environmentVariables = SerenityInfrastructure.getEnvironmentVariables();
 ```
+
+# Report Generation Changes
+
+In Serenity 4.0.x, test execution generates JSON test output files, but not HTML files. To generate the full HTML reports, invoke the `aggregate` task, e.g. `mvn aggregate` or `gradle aggregate`.