diff --git a/kernel/model/flashcard.go b/kernel/model/flashcard.go
index 46774ec32..d5cd2d250 100644
--- a/kernel/model/flashcard.go
+++ b/kernel/model/flashcard.go
@@ -135,6 +135,72 @@ func RemoveFlashcards(deckID string, blockIDs []string) (err error) {
 	deck := Decks[deckID]
 	deckLock.Unlock()
 
+	var rootIDs []string
+	blockRoots := map[string]string{}
+	for _, blockID := range blockIDs {
+		bt := treenode.GetBlockTree(blockID)
+		if nil == bt {
+			continue
+		}
+
+		rootIDs = append(rootIDs, bt.RootID)
+		blockRoots[blockID] = bt.RootID
+	}
+	rootIDs = gulu.Str.RemoveDuplicatedElem(rootIDs)
+
+	trees := map[string]*parse.Tree{}
+	for _, blockID := range blockIDs {
+		rootID := blockRoots[blockID]
+
+		tree := trees[rootID]
+		if nil == tree {
+			tree, _ = loadTreeByBlockID(blockID)
+		}
+		if nil == tree {
+			continue
+		}
+		trees[rootID] = tree
+
+		node := treenode.GetNodeInTree(tree, blockID)
+		if nil == node {
+			continue
+		}
+
+		oldAttrs := parse.IAL2Map(node.KramdownIAL)
+
+		deckAttrs := node.IALAttr("custom-riff-decks")
+		var deckIDs []string
+		for _, dID := range strings.Split(deckAttrs, ",") {
+			if dID != deckID {
+				deckIDs = append(deckIDs, dID)
+			}
+		}
+
+		deckIDs = gulu.Str.RemoveDuplicatedElem(deckIDs)
+		val := strings.Join(deckIDs, ",")
+		val = strings.TrimPrefix(val, ",")
+		val = strings.TrimSuffix(val, ",")
+		if "" == val {
+			node.RemoveIALAttr("custom-riff-decks")
+		} else {
+			node.SetIALAttr("custom-riff-decks", val)
+		}
+
+		if err = indexWriteJSONQueue(tree); nil != err {
+			return
+		}
+
+		cache.PutBlockIAL(blockID, parse.IAL2Map(node.KramdownIAL))
+
+		newAttrs := parse.IAL2Map(node.KramdownIAL)
+		doOp := &Operation{Action: "updateAttrs", Data: map[string]interface{}{"old": oldAttrs, "new": newAttrs}, ID: blockID}
+		trans := []*Transaction{{
+			DoOperations:   []*Operation{doOp},
+			UndoOperations: []*Operation{},
+		}}
+		pushBroadcastAttrTransactions(trans)
+	}
+
 	for _, blockID := range blockIDs {
 		deck.RemoveCard(blockID)
 	}