diff --git a/setup_centos.md b/setup_centos.md
index 0fb80929..acbb34e5 100644
--- a/setup_centos.md
+++ b/setup_centos.md
@@ -129,4 +129,6 @@
 
    pip uninstall websocket-client;
 
-   pip install websocket-client.
+   pip install websocket-client
+
+   pip install service_identity