diff --git a/kernel/model/blockinfo.go b/kernel/model/blockinfo.go
index ea0a55490..4d27daf07 100644
--- a/kernel/model/blockinfo.go
+++ b/kernel/model/blockinfo.go
@@ -36,6 +36,7 @@ import (
 
 type BlockInfo struct {
 	ID           string            `json:"id"`
+	RootID       string            `json:"rootID"`
 	Name         string            `json:"name"`
 	RefCount     int               `json:"refCount"`
 	SubFileCount int               `json:"subFileCount"`
@@ -44,17 +45,17 @@ type BlockInfo struct {
 	Icon         string            `json:"icon"`
 }
 
-func GetDocInfo(rootID string) (ret *BlockInfo) {
+func GetDocInfo(blockID string) (ret *BlockInfo) {
 	WaitForWritingFiles()
 
-	tree, err := loadTreeByBlockID(rootID)
+	tree, err := loadTreeByBlockID(blockID)
 	if nil != err {
-		logging.LogErrorf("load tree by root id [%s] failed: %s", rootID, err)
+		logging.LogErrorf("load tree by root id [%s] failed: %s", blockID, err)
 		return
 	}
 
 	title := tree.Root.IALAttr("title")
-	ret = &BlockInfo{ID: rootID, Name: title}
+	ret = &BlockInfo{ID: blockID, RootID: tree.Root.ID, Name: title}
 	ret.IAL = parse.IAL2Map(tree.Root.KramdownIAL)
 	scrollData := ret.IAL["scroll"]
 	if 0 < len(scrollData) {
@@ -81,7 +82,7 @@ func GetDocInfo(rootID string) (ret *BlockInfo) {
 			}
 		}
 	}
-	ret.RefIDs, _ = sql.QueryRefIDsByDefID(rootID, false)
+	ret.RefIDs, _ = sql.QueryRefIDsByDefID(blockID, false)
 	ret.RefCount = len(ret.RefIDs)
 
 	var subFileCount int