diff --git a/Hadoop-Compatible-File-System.md b/Hadoop-Compatible-File-System.md
index 1b07638..b46e528 100644
--- a/Hadoop-Compatible-File-System.md
+++ b/Hadoop-Compatible-File-System.md
@@ -6,28 +6,46 @@ SeaweedFS excels on small files and has no issue to store large files. Now it is
 ```
 $cd $GOPATH/src/github.com/chrislusf/seaweedfs/other/java/client
 $ mvn install
-$cd $GOPATH/src/github.com/chrislusf/seaweedfs/other/java/hdfs
+
+# build for hadoop2
+$cd $GOPATH/src/github.com/chrislusf/seaweedfs/other/java/hdfs2
 $ mvn package
-$ ls -al target/seaweedfs-hadoop-client-*.jar
+$ ls -al target/seaweedfs-hadoop2-client-*.jar
+
+# build for hadoop3
+$cd $GOPATH/src/github.com/chrislusf/seaweedfs/other/java/hdfs3
+$ mvn package
+$ ls -al target/seaweedfs-hadoop3-client-*.jar
 
 ```
 Or you can download the latest version from MavenCentral
-* https://mvnrepository.com/artifact/com.github.chrislusf/seaweedfs-hadoop-client
-* http://central.maven.org/maven2/com/github/chrislusf/seaweedfs-hadoop-client/
+* https://mvnrepository.com/artifact/com.github.chrislusf/seaweedfs-hadoop2-client
+* http://central.maven.org/maven2/com/github/chrislusf/seaweedfs-hadoop2-client/
+
+* https://mvnrepository.com/artifact/com.github.chrislusf/seaweedfs-hadoop3-client
+* http://central.maven.org/maven2/com/github/chrislusf/seaweedfs-hadoop3-client/
 
 # Test SeaweedFS on Hadoop
 
 Suppose you are getting a new Hadoop installation. Here are the minimum steps to get SeaweedFS to run.
 
-You would need to start a weed filer first, build the seaweedfs-hadoop-client-xxx.jar, and do the following:
+You would need to start a weed filer first, build the seaweedfs-hadoop2-client-xxx.jar 
+or seaweedfs-hadoop3-client-xxx.jar, and do the following:
 
 ```
 $ cd ${HADOOP_HOME}
 # create etc/hadoop/mapred-site.xml, just to satisfy hdfs dfs. skip this if the file already exists.
 $ echo "<configuration></configuration>" > etc/hadoop/mapred-site.xml
+
+# on hadoop2
 $ bin/hdfs dfs -Dfs.defaultFS=seaweedfs://localhost:8888 \
                -Dfs.seaweedfs.impl=seaweed.hdfs.SeaweedFileSystem \
-               -libjars ./seaweedfs-hadoop-client-x.x.x.jar \
+               -libjars ./seaweedfs-hadoop2-client-x.x.x.jar \
+               -ls /
+# or on hadoop3
+$ bin/hdfs dfs -Dfs.defaultFS=seaweedfs://localhost:8888 \
+               -Dfs.seaweedfs.impl=seaweed.hdfs.SeaweedFileSystem \
+               -libjars ./seaweedfs-hadoop3-client-x.x.x.jar \
                -ls /
 
 ```
@@ -57,7 +75,10 @@ $ bin/hadoop classpath
 
 # Copy SeaweedFS HDFS client jar to one of the folders
 $ cd ${HADOOP_HOME}
-$ cp ./seaweedfs-hadoop-client-x.x.x.jar share/hadoop/common/lib/
+# for hadoop2
+$ cp ./seaweedfs-hadoop2-client-x.x.x.jar share/hadoop/common/lib/
+# or for hadoop3
+$ cp ./seaweedfs-hadoop3-client-x.x.x.jar share/hadoop/common/lib/
 ```
 
 Now you can do this:
@@ -83,12 +104,12 @@ To make these files visible to Spark, set HADOOP_CONF_DIR in $SPARK_HOME/conf/sp
 
 ## installation not inheriting from Hadoop cluster configuration
 
-Copy the seaweedfs-hadoop-client-x.x.x.jar to all executor machines.
+Copy the seaweedfs-hadoop2-client-x.x.x.jar to all executor machines.
 
 Add the following to spark/conf/spark-defaults.conf on every node running Spark
 ```
-spark.driver.extraClassPath   /path/to/seaweedfs-hadoop-client-x.x.x.jar
-spark.executor.extraClassPath /path/to/seaweedfs-hadoop-client-x.x.x.jar
+spark.driver.extraClassPath   /path/to/seaweedfs-hadoop2-client-x.x.x.jar
+spark.executor.extraClassPath /path/to/seaweedfs-hadoop2-client-x.x.x.jar
 ```
 
 And modify the configuration at runntime: