diff --git a/README.md b/README.md
index 2e2fc44bae..cd40df5c4d 100644
--- a/README.md
+++ b/README.md
@@ -251,7 +251,7 @@ The important configuration is listed as following.
 |rss.server.commit.timeout|600000|Timeout when commit shuffle data (ms)|
 |rss.storage.type|-|Supports MEMORY_LOCALFILE, MEMORY_HDFS, MEMORY_LOCALFILE_HDFS|
 |rss.server.flush.cold.storage.threshold.size|64M| The threshold of data size for LOACALFILE and HDFS if MEMORY_LOCALFILE_HDFS is used|
-
+|rss.server.tags|-|The comma-separated list of tags to indicate the shuffle server's attributes. It will be used as the assignment basis for the coordinator|
 
 ### Shuffle Client
 
diff --git a/docs/client_guide.md b/docs/client_guide.md
index ac0ec1012e..ba26f3c571 100644
--- a/docs/client_guide.md
+++ b/docs/client_guide.md
@@ -86,7 +86,7 @@ These configurations are shared by all types of clients.
 |<client_type>.rss.storage.type|-|Supports MEMORY_LOCALFILE, MEMORY_HDFS, MEMORY_LOCALFILE_HDFS|
 |<client_type>.rss.client.read.buffer.size|14m|The max data size read from storage|
 |<client_type>.rss.client.send.threadPool.size|5|The thread size for send shuffle data to shuffle server|
-
+|<client_type>.rss.client.assignment.tags|-|The comma-separated list of tags for deciding assignment shuffle servers. Notice that the SHUFFLE_SERVER_VERSION will always as the assignment tag whether this conf is set or not|
 Notice:
 
 1. `<client_type>` should be `spark` or `mapreduce`