diff --git a/21_rssviewer_xxe/README.md b/21_rssviewer_xxe/README.md
index 5b9187a..2190b74 100644
--- a/21_rssviewer_xxe/README.md
+++ b/21_rssviewer_xxe/README.md
@@ -2,7 +2,7 @@
 
 Here are the tools required to run the web application.
 
- - Java
+ - Java 8 (JRE+JDK)
  - Gradle
  - Docker
  - Docker-compose