diff --git a/src/infrastructure/markup/blockrule/PhutilRemarkupCodeBlockRule.php b/src/infrastructure/markup/blockrule/PhutilRemarkupCodeBlockRule.php
--- a/src/infrastructure/markup/blockrule/PhutilRemarkupCodeBlockRule.php
+++ b/src/infrastructure/markup/blockrule/PhutilRemarkupCodeBlockRule.php
@@ -44,7 +44,17 @@
   }
 
   public function markupText($text, $children) {
-    if (preg_match('/^\s*```/', $text)) {
+    // Header/footer eventially useful to be nice with "flavored markdown".
+    // When it starts with ```stuff    the header is 'stuff' (->language)
+    // When it ends with      stuff``` the footer is 'stuff' (->garbage)
+    $header_line = null;
+    $footer_line = null;
+
+    if (preg_match('/^\s*```(.*)/', $text, $matches)) {
+      if (isset($matches[1])) {
+        $header_line = $matches[1];
+      }
+
       // If this is a ```-style block, trim off the backticks and any leading
       // blank line.
       $text = preg_replace('/^\s*```(\s*\n)?/', '', $text);
@@ -52,6 +62,13 @@
     }
 
     $lines = explode("\n", $text);
+
+    // If we have a flavored header, it has sense to look for the footer.
+    if ($header_line !== null && $lines) {
+      $footer_line = $lines[last_key($lines)];
+    }
+
+    // Strip final empty lines
     while ($lines && !strlen(last($lines))) {
       unset($lines[last_key($lines)]);
     }
@@ -65,20 +82,35 @@
 
     $parser = new PhutilSimpleOptions();
     $custom = $parser->parse(head($lines));
+    $valid_options = null;
     if ($custom) {
-      $valid = true;
+      $valid_options = true;
       foreach ($custom as $key => $value) {
         if (!array_key_exists($key, $options)) {
-          $valid = false;
+          $valid_options = false;
           break;
         }
       }
-      if ($valid) {
+      if ($valid_options) {
         array_shift($lines);
         $options = $custom + $options;
       }
     }
 
+    // Check for flavored markdown only if there was no "lang=" or other options.
+    // We are strict to don't conflict with legitimate content in Remarkup.
+    if (
+      $valid_options === false &&
+      $header_line !== null &&
+      $footer_line === '' &&
+      count($lines) > 1
+    ) {
+      if ($this->isKnownLanguageCode($header_line)) {
+        array_shift($lines);
+        $options['lang'] = $header_line;
+      }
+    }
+
     // Normalize the text back to a 0-level indent.
     $min_indent = 80;
     foreach ($lines as $line) {
@@ -249,4 +281,59 @@
         $engine->highlightSource($options['lang'], $text)));
   }
 
+  /**
+   * Check if a language code can be used in flavored markdown.
+   * @param  string $lang Language code after backticks
+   * @return bool
+   */
+  private function isKnownLanguageCode($lang) {
+    return in_array($lang, $this->getKnownLanguageCodes(), true);
+  }
+
+  /**
+   * Get all the available languages for flavored markdown.
+   * @return array
+   */
+  private function getKnownLanguageCodes() {
+    // This is a friendly subset from https://pygments.org/languages/
+    return [
+      'arduino',
+      'assembly',
+      'awk',
+      'bash',
+      'bat',
+      'c',
+      'cmake',
+      'cobol',
+      'cpp',
+      'css',
+      'csharp',
+      'dart',
+      'delphi',
+      'fortran',
+      'go',
+      'groovy',
+      'haskell',
+      'java',
+      'javascript',
+      'kotlin',
+      'lisp',
+      'lua',
+      'matlab',
+      'make',
+      'perl',
+      'php',
+      'powershell',
+      'python',
+      'r',
+      'ruby',
+      'rust',
+      'scala',
+      'sh',
+      'sql',
+      'typescript',
+      'vba',
+    ];
+  }
+
 }
diff --git a/src/infrastructure/markup/remarkup/__tests__/PhutilRemarkupEngineTestCase.php b/src/infrastructure/markup/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
--- a/src/infrastructure/markup/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
+++ b/src/infrastructure/markup/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
@@ -2,6 +2,8 @@
 
 /**
  * Test cases for @{class:PhutilRemarkupEngine}.
+ * @TODO: This unit is not always triggered when you need it.
+ *        https://we.phorge.it/T15500
  */
 final class PhutilRemarkupEngineTestCase extends PhutilTestCase {
 
diff --git a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-flavored.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-flavored.txt
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-flavored.txt
@@ -0,0 +1,7 @@
+```cpp
+code
+```
+~~~~~~~~~~
+<div class="remarkup-code-block" data-code-lang="cpp" data-sigil="remarkup-code-block"><pre class="remarkup-code">code</pre></div>
+~~~~~~~~~~
+  code
diff --git a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt
@@ -0,0 +1,18 @@
+```#comment
+code
+
+#more comment
+more code```
+
+~~~~~~~~~~
+<div class="remarkup-code-block" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code">#comment
+code
+
+#more comment
+more code</pre></div>
+~~~~~~~~~~
+  #comment
+  code
+  
+  #more comment
+  more code
diff --git a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-empty.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-empty.txt
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-empty.txt
@@ -0,0 +1,9 @@
+```
+cpp
+second line```
+~~~~~~~~~~
+<div class="remarkup-code-block" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code">cpp
+second line</pre></div>
+~~~~~~~~~~
+  cpp
+  second line
diff --git a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored.txt
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored.txt
@@ -0,0 +1,20 @@
+```cpp
+code
+
+more code
+
+more code
+```
+
+~~~~~~~~~~
+<div class="remarkup-code-block" data-code-lang="cpp" data-sigil="remarkup-code-block"><pre class="remarkup-code">code
+
+more code
+
+more code</pre></div>
+~~~~~~~~~~
+  code
+  
+  more code
+  
+  more code