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
@@ -44,11 +44,18 @@
   }
 
   public function markupText($text, $children) {
-    if (preg_match('/^\s*```/', $text)) {
+    $header_line = null;
+    if (preg_match('/^\s*```(.*)/', $text, $matches)) {
       // If this is a ```-style block, trim off the backticks and any leading
       // blank line.
       $text = preg_replace('/^\s*```(\s*\n)?/', '', $text);
       $text = preg_replace('/```\s*$/', '', $text);
+
+      // Just after the opening backticks there can be something valuable.
+      // Note that the general options are not necessarily here.
+      if (isset($matches[1])) {
+        $header_line = $matches[1];
+      }
     }
 
     $lines = explode("\n", $text);
@@ -79,6 +86,21 @@
       }
     }
 
+    // Language expressed as Flavored Markdown
+    // If language was not specified using lang=something, we parse
+    // the thing after the first backticks.
+    // We skip one-line blocks, to do not eat potential one-line content.
+    // If found, we remove that line since it is not part of the content.
+    // In this early version we are somehow strict and we do not support
+    // c# or c++ or enttalk/2 etc - but you can 'csharp', 'cpp', etc.
+    // The goal is to avoid false positives taking away content.
+    if (empty($options['lang']) && $header_line && count($lines) > 1) {
+      if (preg_match('/^[a-z][a-z0-9\-]*$/', $header_line)) {
+        $options['lang'] = $header_line;
+        array_shift($lines);
+      }
+    }
+
     // Normalize the text back to a 0-level indent.
     $min_indent = 80;
     foreach ($lines as $line) {
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 +1,6 @@
+```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.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt
copy from src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt
copy to src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt
--- a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi-flavored-comment.txt
@@ -1,18 +1,18 @@
-```code
-
-more code
+```#comment
+code
 
+#more comment
 more code```
 
 ~~~~~~~~~~
-<div class="remarkup-code-block" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code">code
-
-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 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 +1,19 @@
+```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
diff --git a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt
--- a/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt
+++ b/src/infrastructure/markup/remarkup/__tests__/remarkup/tick-block-multi.txt
@@ -1,17 +1,17 @@
-```code
+```code code
 
 more code
 
 more code```
 
 ~~~~~~~~~~
-<div class="remarkup-code-block" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code">code
+<div class="remarkup-code-block" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code">code code
 
 more code
 
 more code</pre></div>
 ~~~~~~~~~~
-  code
+  code code
   
   more code