doc: rgw: note rgw_enable_usage_log option in adminops guide

Signed-off-by: hrchu <petertc@gmail.com>

diff --git a/doc/radosgw/adminops.rst b/doc/radosgw/adminops.rst
index 6c69f43974044d822f1c645b6463bbeb625483c1..df62be2c41fc5aba860c3e466186dbd4039522f8 100644 (file)
--- a/doc/radosgw/adminops.rst
+++ b/doc/radosgw/adminops.rst
@@ -13,6 +13,10 @@ Get Usage
 
 Request bandwidth usage information.
 
+Note: this feature is disabled by default, can be enabled by setting ``rgw
+enable usage log = true`` in the appropriate section of ceph.conf. For changes
+in ceph.conf to take effect, radosgw process restart is needed.
+
 :caps: usage=read
 
 Syntax
@@ -163,6 +167,10 @@ Trim Usage
 Remove usage information. With no dates specified, removes all usage
 information.
 
+Note: this feature is disabled by default, can be enabled by setting ``rgw
+enable usage log = true`` in the appropriate section of ceph.conf. For changes
+in ceph.conf to take effect, radosgw process restart is needed.
+
 :caps: usage=write
 
 Syntax