diff --git a/metainfo/fileinfo.go b/metainfo/fileinfo.go
index 25c262529b..cb9c5be849 100644
--- a/metainfo/fileinfo.go
+++ b/metainfo/fileinfo.go
@@ -10,8 +10,10 @@ import (
 type FileInfo struct {
 	// BEP3. With BEP 47 this can be optional, but we have no way to describe that without breaking
 	// the API.
-	Length   int64    `bencode:"length"`
-	Path     []string `bencode:"path"` // BEP3
+	Length int64    `bencode:"length"`
+	Path   []string `bencode:"path"` // BEP3
+	// Unofficial extension by BiglyBT? https://github.com/BiglySoftware/BiglyBT/issues/1274. Might
+	// be a safer bet when available: https://github.com/anacrolix/torrent/pull/915.
 	PathUtf8 []string `bencode:"path.utf-8,omitempty"`
 
 	ExtendedFileAttrs