diff --git a/admin.php b/admin.php
index 0846083..4bd206e 100644
--- a/admin.php
+++ b/admin.php
@@ -675,7 +675,7 @@ fb_layout_head('管理后台', ['robots' => 'noindex,nofollow']);
       <label class="field"><span>单个视频上限（MB）</span>
         <input type="number" step="1" min="1" max="500" name="upload_video_max_bytes" value="<?php echo $mb(fb_upload_cfg('video_max_bytes', 52428800)); ?>"></label>
       <label class="field"><span>全站附件总量上限（MB）</span>
-        <input type="number" step="16" min="10" name="upload_total_cap_bytes" value="<?php echo $mb(fb_upload_cfg('total_cap_bytes', 1073741824)); ?>"></label>
+        <input type="number" step="any" min="10" max="100000" name="upload_total_cap_bytes" value="<?php echo $mb(fb_upload_cfg('total_cap_bytes', 1073741824)); ?>"></label>
       <label class="field"><span>附件保留天数</span>
         <input type="number" name="upload_retention_days" min="1" max="3650" value="<?php echo (int)fb_upload_cfg('retention_days', 365); ?>"></label>
       <label class="field"><span>每 IP 每小时最多上传几次</span>