diff --git a/README.md b/README.md
index 731895bb6..f2132370a 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,10 @@ automating things or if you're facing the `No locally installed
 toolchains match and toolchain download repositories have not
 been defined` error.
 
+Please note however that you should only pass this option if your
+default, installed JDK is matching Java 21 or you will experience
+issues.
+
 ## JVM arguments
 You can pass the following arguments to modify the
 behaviour of JVMs used for executing projects.