diff --git a/doc/source/install/index.rst b/doc/source/install/index.rst
index 2b2a36a..ea54131 100644
--- a/doc/source/install/index.rst
+++ b/doc/source/install/index.rst
@@ -10,7 +10,8 @@ fenix service installation guide
    verify.rst
    next-steps.rst
 
-The fenix service (fenix) provides...
+The fenix service provides in-service host maintenance for distributed
+applications via communication with the VNFM during the maintenance procedure.
 
 This chapter assumes a working setup of OpenStack following the
 `OpenStack Installation Tutorial