diff --git a/go/weed/master.go b/go/weed/master.go
index 2f0a58038..f0b82d414 100644
--- a/go/weed/master.go
+++ b/go/weed/master.go
@@ -31,7 +31,7 @@ var (
 	masterIp                = cmdMaster.Flag.String("ip", "localhost", "master ip address")
 	metaFolder              = cmdMaster.Flag.String("mdir", os.TempDir(), "data directory to store meta data")
 	masterPeers             = cmdMaster.Flag.String("peers", "", "other master nodes in comma separated ip:port list")
-	volumeSizeLimitMB       = cmdMaster.Flag.Uint("volumeSizeLimitMB", 32*1000, "Default Volume Size in MegaBytes")
+	volumeSizeLimitMB       = cmdMaster.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	mpulse                  = cmdMaster.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 	confFile                = cmdMaster.Flag.String("conf", "/etc/weedfs/weedfs.conf", "xml configuration file")
 	defaultReplicaPlacement = cmdMaster.Flag.String("defaultReplication", "000", "Default replication type if not specified.")
diff --git a/go/weed/server.go b/go/weed/server.go
index 6047030df..21543b1d7 100644
--- a/go/weed/server.go
+++ b/go/weed/server.go
@@ -45,7 +45,7 @@ var (
 	serverPeers                   = cmdServer.Flag.String("peers", "", "other master nodes in comma separated ip:masterPort list")
 	masterPort                    = cmdServer.Flag.Int("masterPort", 9333, "master server http listen port")
 	masterMetaFolder              = cmdServer.Flag.String("mdir", "", "data directory to store meta data, default to same as -dir specified")
-	masterVolumeSizeLimitMB       = cmdServer.Flag.Uint("volumeSizeLimitMB", 32*1000, "Default Volume Size in MegaBytes")
+	masterVolumeSizeLimitMB       = cmdServer.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	masterConfFile                = cmdServer.Flag.String("conf", "/etc/weedfs/weedfs.conf", "xml configuration file")
 	masterDefaultReplicaPlacement = cmdServer.Flag.String("defaultReplicaPlacement", "000", "Default replication type if not specified.")
 	volumePort                    = cmdServer.Flag.Int("port", 8080, "volume server http listen port")