diff --git a/docs/application_development.md b/docs/application_development.md
index 6bfa3fd..f3398e2 100644
@@ -695,7 +695,8 @@ submitted to the Hadoop cluster and executes as a multi-processapplication on
Before you start deploying, testing and troubleshooting your
application on a cluster, you should ensure that Hadoop (version 2.6.0
or later) is properly installed and
-you have basic skills for working with it.
+you have basic skills for working with it. Due to a known vulnerability in Apache Yarn, Apex community
+recommends Hadoop version 2.7.4 or later.