diff --git a/notes/算法 - 符号表.md b/notes/算法 - 符号表.md
index bae9ad51..79fc8bb6 100644
--- a/notes/算法 - 符号表.md	
+++ b/notes/算法 - 符号表.md	
@@ -127,8 +127,10 @@ public class ListUnorderedST<Key, Value> implements UnorderedST<Key, Value> {
     public void delete(Key key) {
         if (first == null)
             return;
-        if (first.key.equals(key))
+        if (first.key.equals(key)) {
             first = first.next;
+            return;
+        }
         Node pre = first, cur = first.next;
         while (cur != null) {
             if (cur.key.equals(key)) {