diff --git a/mateclaw-ui/src/views/Tools.vue b/mateclaw-ui/src/views/Tools.vue
index 08ada340..5a5a4342 100644
--- a/mateclaw-ui/src/views/Tools.vue
+++ b/mateclaw-ui/src/views/Tools.vue
@@ -274,9 +274,10 @@ async function toggleTool(tool: Tool) {
 .tools-section-title { font-size: 15px; font-weight: 700; color: var(--mc-text-primary); }
 .tools-section-count { font-size: 12px; font-weight: 600; color: var(--mc-text-secondary); background: var(--mc-bg-muted); padding: 2px 8px; border-radius: 10px; }
 .tools-section-hint { font-size: 12px; color: var(--mc-text-tertiary); }
-/* 复合选择器 .row-btn.tier-btn (specificity 0,2,0) 必须高于 .row-btn (0,1,0),
-   否则 .row-btn 后置的 width:30px / display:flex 等会反向覆盖文字按钮的
-   width:auto / line-height,导致 "→ 扩展" / "← 核心" 文字溢出 30px 矮盒。 */
+/* The compound selector .row-btn.tier-btn (specificity 0,2,0) must outrank plain
+   .row-btn (0,1,0); otherwise the later-declared .row-btn width:30px / display:flex
+   overrides the text button's width:auto / line-height, overflowing the tier
+   label ("→ extensions" / "← core") out of the 30px box. */
 .row-btn.tier-btn { width: auto; height: 30px; padding: 0 10px; font-size: 12px; font-weight: 600; line-height: 30px; white-space: nowrap; color: var(--mc-text-secondary); }
 .row-btn.tier-btn:hover { background: var(--mc-bg-sunken); color: var(--mc-primary); border-color: var(--mc-primary); }
 .tier-locked { display: inline-flex; align-items: center; padding: 0 8px; font-size: 11px; color: var(--mc-text-tertiary); cursor: help; }