diff --git a/doc/source/install/manual.rst b/doc/source/install/manual.rst
index 85fc99eb4..79545831c 100644
--- a/doc/source/install/manual.rst
+++ b/doc/source/install/manual.rst
@@ -510,10 +510,15 @@ shipped in the Ceilometer egg and defined in the entry_points as follows::
 To use both dispatchers on a Ceilometer collector service, add the following
 line in file ceilometer.conf::
 
-   [collector]
+   [DEFAULT]
    dispatcher=database
    dispatcher=file
 
+.. note::
+
+    dispatcher is in [collector] section in Havana release, but it is
+    deprecated in Icehouse.
+
 If there is no dispatcher present, database dispatcher is used as the
 default. If in some cases such as traffic tests, no dispatcher is needed,
 one can configure the line like the following::