diff --git a/WebUI-API-(qBittorrent-4.1).md b/WebUI-API-(qBittorrent-4.1).md
index d155e9e..09ab864 100644
--- a/WebUI-API-(qBittorrent-4.1).md
+++ b/WebUI-API-(qBittorrent-4.1).md
@@ -1495,7 +1495,7 @@ Property         | Type     | Description
 -----------------|----------|-------------
 `url`            | string   | Tracker url
 `status`         | integer  | Tracker status. See the table below for possible values
-`tier`           | integer  | Tracker priority tier. Lower tier trackers are tried before higher tiers
+`tier`           | integer  | Tracker priority tier. Lower tier trackers are tried before higher tiers. Tier numbers are valid when `>= 0`, `< 0` is used as placeholder when `tier` does not exist for special entries (such as DHT).
 `num_peers`      | integer  | Number of peers for current torrent, as reported by the tracker
 `num_seeds`      | integer  | Number of seeds for current torrent, asreported by the tracker
 `num_leeches`    | integer  | Number of leeches for current torrent, as reported by the tracker