diff --git a/README.md b/README.md
index cbff6ea..42c97e8 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,7 @@ The Hadoop Ecosystem Table
 This page is a summary to keep the track of Hadoop related projects, and relevant projects around Big Data scene focused on the open source, free software environment.
 
 http://hadoopecosystemtable.github.io/
+
+Apache documentation for HDFS 2.x commands: 
+https://hadoop.apache.org/docs/r2.4.1/hadoop-project-dist/hadoop-common/FileSystemShell.html 
+