diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index 54b0da19d..ce53fdc96 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -363,6 +363,8 @@ message DiskStatus {
     uint64 all = 2;
     uint64 used = 3;
     uint64 free = 4;
+    float percent_free = 5;
+    float percent_used = 6;
 }
 
 message MemStatus {