diff --git a/stackrc b/stackrc
index cc07906..3a19cdb 100644
--- a/stackrc
+++ b/stackrc
@@ -6,7 +6,12 @@
 # by default you can append them in your ENABLED_SERVICES variable in
 # your localrc. For example for swift you can just add this in your
 # localrc to add it with the other services:
-# ENABLED_SERVICES="$ENABLED_SERVICES,swift"
+# ENABLED_SERVICES+=,swift
+#
+# If you like to explicitly remove services you can add a -$service in
+# ENABLED_SERVICES, for example in your localrc to install all defaults but not
+# nova-volume you would just need to set this :
+# ENABLED_SERVICES+=,-n-vol
 ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-obj,n-cpu,n-net,n-vol,n-sch,n-novnc,n-xvnc,n-cauth,horizon,mysql,rabbit
 
 # Set the default Nova APIs to enable