diff --git a/data/wiki/guanghan_topology_demo.html b/data/wiki/guanghan_topology_demo.html
index de9a32b..da0d4d5 100644
--- a/data/wiki/guanghan_topology_demo.html
+++ b/data/wiki/guanghan_topology_demo.html
@@ -145,6 +145,7 @@
   .radiator { pointer-events: none; }
   .radiator rect { fill: #6b5814; stroke: var(--radiator); stroke-width: 2; vector-effect: non-scaling-stroke; }
   .radiator line { stroke: #f8e798; stroke-width: 1.5; vector-effect: non-scaling-stroke; }
+  .radiator-label { fill: #f4df7b; font-size: 15px; font-weight: 650; text-anchor: middle; }
 
   .click-note {
     margin: 13px 0 0;
@@ -339,18 +340,22 @@
       <g class="radiator" aria-label="北部大型折叠散热面板">
         <rect x="820" y="972" width="130" height="16" rx="3"/>
         <line x1="850" y1="973" x2="850" y2="987"/><line x1="885" y1="973" x2="885" y2="987"/><line x1="920" y1="973" x2="920" y2="987"/>
+        <text class="radiator-label" x="885" y="964">散热器</text>
       </g>
       <g class="radiator" aria-label="西部大型折叠散热面板">
         <rect x="345" y="1232" width="130" height="16" rx="3"/>
         <line x1="375" y1="1233" x2="375" y2="1247"/><line x1="410" y1="1233" x2="410" y2="1247"/><line x1="445" y1="1233" x2="445" y2="1247"/>
+        <text class="radiator-label" x="410" y="1224">散热器</text>
       </g>
       <g class="radiator" aria-label="东部大型折叠散热面板">
         <rect x="1025" y="1232" width="130" height="16" rx="3"/>
         <line x1="1055" y1="1233" x2="1055" y2="1247"/><line x1="1090" y1="1233" x2="1090" y2="1247"/><line x1="1125" y1="1233" x2="1125" y2="1247"/>
+        <text class="radiator-label" x="1090" y="1224">散热器</text>
       </g>
       <g class="radiator" aria-label="南部大型折叠散热面板">
         <rect x="790" y="1518" width="130" height="16" rx="3"/>
         <line x1="820" y1="1519" x2="820" y2="1533"/><line x1="855" y1="1519" x2="855" y2="1533"/><line x1="890" y1="1519" x2="890" y2="1533"/>
+        <text class="radiator-label" x="855" y="1510">散热器</text>
       </g>
 
       <!-- Power cross nodes -->
diff --git a/tests/test_guanghan_topology_demo.py b/tests/test_guanghan_topology_demo.py
index 27ac135..6c57692 100644
--- a/tests/test_guanghan_topology_demo.py
+++ b/tests/test_guanghan_topology_demo.py
@@ -54,6 +54,25 @@ class GuanghanTopologySourceTests(unittest.TestCase):
             r'<(?:g|rect)[^>]+class="[^"]*radiator[^"]*"[^>]+data-module=',
         )
 
+    def test_each_radiator_has_a_visible_text_label(self) -> None:
+        radiator_groups = re.findall(
+            r'<g class="radiator"[^>]*>(.*?)</g>',
+            self.html,
+            flags=re.S,
+        )
+        self.assertEqual(len(radiator_groups), 4)
+        for group in radiator_groups:
+            self.assertIn(">散热器</text>", group)
+            rect = re.search(r'<rect x="(\d+)" y="(\d+)" width="(\d+)"', group)
+            label = re.search(r'<text[^>]+x="(\d+)" y="(\d+)"[^>]*>散热器</text>', group)
+            self.assertIsNotNone(rect)
+            self.assertIsNotNone(label)
+            rect_x, rect_y, rect_width = map(int, rect.groups())
+            label_x, label_y = map(int, label.groups())
+            self.assertGreaterEqual(label_x, rect_x)
+            self.assertLessEqual(label_x, rect_x + rect_width)
+            self.assertLess(label_y, rect_y)
+
     def test_future_extensions_exist_only_as_source_comments(self) -> None:
         comments = "\n".join(re.findall(r"<!--(.*?)-->", self.html, flags=re.S))
         visible_source = re.sub(r"<!--.*?-->", "", self.html, flags=re.S)