diff --git a/bin/asd b/bin/asd
index 979448d8..f4abbe99 100755
--- a/bin/asd
+++ b/bin/asd
@@ -71,7 +71,6 @@ if ($status !== 0) {
     echo 'Warning: Graphviz error. https://graphviz.org/download/' . PHP_EOL;
 }
 
-$ext = 'html';
 $index = new IndexPage($profile, $config->outputMode);
 file_put_contents($index->file, $index->content);
 echo "ASD generated. {$index->file}" . PHP_EOL;
diff --git a/src/IndexPage.php b/src/IndexPage.php
index 141a375a..c3f028c2 100644
--- a/src/IndexPage.php
+++ b/src/IndexPage.php
@@ -10,7 +10,6 @@
 use function nl2br;
 use function pathinfo;
 use function sprintf;
-use function str_replace;
 use function strtoupper;
 use function uasort;
 
@@ -40,8 +39,9 @@ public function __construct(Profile $profile, string $mode = DumpDocs::MODE_HTML
             return $order[$a->type] <=> $order[$b->type];
         });
         $linkRelations = $this->linkRelations($profile->linkRelations);
-        $semantics = $this->semantics($descriptors);
-        $tags = $this->tags($profile->tags);
+        $ext = $mode === DumpDocs::MODE_MARKDOWN ? 'md' : DumpDocs::MODE_HTML;
+        $semantics = $this->semantics($descriptors, $ext);
+        $tags = $this->tags($profile->tags, $ext);
         $htmlTitle = htmlspecialchars($profile->title);
         $htmlDoc = nl2br(htmlspecialchars($profile->doc));
         $profileImage = $mode === DumpDocs::MODE_HTML ? 'docs/asd.html' : 'profile.svg';
@@ -55,26 +55,18 @@ public function __construct(Profile $profile, string $mode = DumpDocs::MODE_HTML
  * Semantic Descriptors
 {$semantics}{$tags}{$linkRelations}
 EOT;
-        $fileBase  = sprintf('%s/index.', dirname($profile->alpsFile));
-        if ($mode === DumpDocs::MODE_MARKDOWN) {
-            $this->content = str_replace('.html', '.md', $md);
-            $this->file = $fileBase . 'md';
-
-            return;
-        }
-
-        $this->content = (new MdToHtml())('ALPS', $md);
-        $this->file = $fileBase . 'html';
+        $this->file = sprintf('%s/index.%s', dirname($profile->alpsFile), $ext);
+        $this->content = $mode === DumpDocs::MODE_MARKDOWN ? $md : (new MdToHtml())('ALPS', $md);
     }
 
     /**
      * @param array<string, AbstractDescriptor> $semantics
      */
-    private function semantics(array $semantics): string
+    private function semantics(array $semantics, string $ext): string
     {
         $lines = [];
         foreach ($semantics as $semantic) {
-            $href = sprintf('docs/%s.%s.html', $semantic->type, $semantic->id);
+            $href = sprintf('docs/%s.%s.%s', $semantic->type, $semantic->id, $ext);
             $title = $semantic->title ? sprintf(', %s', $semantic->title) : '';
             $lines[] = sprintf('   * [%s](%s) (%s)%s', $semantic->id, $href, $semantic->type, $title);
         }
@@ -85,7 +77,7 @@ private function semantics(array $semantics): string
     /**
      * @param array<string, list<string>> $tags
      */
-    private function tags(array $tags): string
+    private function tags(array $tags, string $ext): string
     {
         if ($tags === []) {
             return '';
@@ -93,7 +85,7 @@ private function tags(array $tags): string
 
         $lines = [];
         foreach ($tags as $tag => $item) {
-            $href = "docs/tag.{$tag}.html";
+            $href = "docs/tag.{$tag}.{$ext}";
             $lines[] = "   * [{$tag}]({$href})";
         }
 
diff --git a/tests/Fake/alps_has_single_link.json b/tests/Fake/alps_has_single_link.json
index 22f31cea..bf4da789 100644
--- a/tests/Fake/alps_has_single_link.json
+++ b/tests/Fake/alps_has_single_link.json
@@ -2,7 +2,7 @@
   "$schema": "https://alps-io.github.io/schemas/alps.json",
   "alps": {
     "link": {
-      "href": "https://github.com/koriym/app-state-diagram/",
+      "href": "https://github.com/koriym/app-state-diagram/index.html",
       "rel": "about"
     },
     "descriptor": [
diff --git a/tests/IndexPageTest.php b/tests/IndexPageTest.php
index 6dead157..4fbe3563 100644
--- a/tests/IndexPageTest.php
+++ b/tests/IndexPageTest.php
@@ -60,7 +60,14 @@ public function testLinkRelationsString(): void
     {
         $alpsFile = __DIR__ . '/Fake/alps_has_single_link.json';
         $html = (new IndexPage(new Profile($alpsFile, new LabelName())))->content;
-        $this->assertStringContainsString('<li>rel: about <a rel="about" href="https://github.com/koriym/app-state-diagram/">https://github.com/koriym/app-state-diagram/</a></li>', $html);
+        $this->assertStringContainsString('<li>rel: about <a rel="about" href="https://github.com/koriym/app-state-diagram/index.html">https://github.com/koriym/app-state-diagram/index.html</a></li>', $html);
+    }
+
+    public function testLinkRelationsStringMarkdownMode(): void
+    {
+        $alpsFile = __DIR__ . '/Fake/alps_has_single_link.json';
+        $md = (new IndexPage(new Profile($alpsFile, new LabelName()), DumpDocs::MODE_MARKDOWN))->content;
+        $this->assertStringContainsString('* rel: about <a rel="about" href="https://github.com/koriym/app-state-diagram/index.html">https://github.com/koriym/app-state-diagram/index.html</a>', $md);
     }
 
     public function testMultipleLinkRelationsString(): void