diff --git a/docs/video/videostream_url.md b/docs/video/videostream_url.md
index 1ed73a9..b11c90c 100644
--- a/docs/video/videostream_url.md
+++ b/docs/video/videostream_url.md
@@ -556,7 +556,7 @@ curl -G 'https://api.bilibili.com/x/player/playurl' \
     --data-urlencode 'avid=969628065' \
     --data-urlencode 'cid=244954665' \
     --data-urlencode 'qn=80' \
-    --data-urlencode 'fnval=0' \
+    --data-urlencode 'fnval=4048' \ # 4048 为所有 dash 选项或运算的结果
     --data-urlencode 'fnver=0' \
     --data-urlencode 'fourk=1' \
     -b 'SESSDATA=xxx'
@@ -569,7 +569,7 @@ curl -G 'https://api.bilibili.com/x/player/playurl' \
     --data-urlencode 'bvid=BV1rp4y1e745' \
     --data-urlencode 'cid=244954665' \
     --data-urlencode 'qn=80' \
-    --data-urlencode 'fnval=0' \
+    --data-urlencode 'fnval=4048' \
     --data-urlencode 'fnver=0' \
     --data-urlencode 'fourk=1' \
     -b 'SESSDATA=xxx'