diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6994f9e9..8551f837 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,11 +17,12 @@ Yii Framework 2 apidoc extension Change Log
 - Bug #179: Fixed incorrect output when string type hint is used in method parameters (arogachev)
 - Bug #199: Fixed processing of nullable return types (arogachev)
 - Bug #148: Fixed processing of code containing uniform variable syntax (arogachev)
-- Enh #143: Do not include methods and properties marked as internal (arogachev)
-- Bug #197: Adapted fixing of Markdown links for multiple links (arogachev)
-- Bug #128: Fixed extracting of first sentence from the text containing backticks (arogachev)
-- Enh #209: Added support for todos in properties and methods (arogachev)
 - Enh #18: Added pretty print for arrays (arogachev)
+- Enh #209: Added support for todos in properties and methods (arogachev)
+- Bug #128: Fixed extracting of first sentence from the text containing backticks (arogachev)
+- Bug #197: Adapted fixing of Markdown links for multiple links (arogachev)
+- Enh #143: Do not include methods and properties marked as internal (arogachev)
+- Enh #147: Added feature of viewing method source code without external links (arogachev)
 
 
 2.1.6 May 05, 2021
diff --git a/models/BaseDoc.php b/models/BaseDoc.php
index ab8fbd4b..324064ba 100644
--- a/models/BaseDoc.php
+++ b/models/BaseDoc.php
@@ -50,7 +50,7 @@ class BaseDoc extends BaseObject
 
     /**
      * @param Type|null $aggregatedType
-     * @return string[]|array
+     * @return string[]
      */
     protected function splitTypes($aggregatedType)
     {
diff --git a/models/MethodDoc.php b/models/MethodDoc.php
index 226cbd03..1006459b 100644
--- a/models/MethodDoc.php
+++ b/models/MethodDoc.php
@@ -24,6 +24,10 @@ class MethodDoc extends FunctionDoc
     public $visibility;
     // will be set by creating class
     public $definedBy;
+    /**
+     * @var string
+     */
+    public $sourceCode = '';
 
 
     /**
@@ -44,5 +48,10 @@ public function __construct($reflector = null, $context = null, $config = [])
         $this->isStatic = $reflector->isStatic();
 
         $this->visibility = $reflector->getVisibility();
+
+        $lines = file($this->sourceFile);
+        for ($i = $this->startLine - 1; $i <= $this->endLine - 1; $i++) {
+            $this->sourceCode .= substr($lines[$i], 4);
+        }
     }
 }
diff --git a/templates/html/ApiRenderer.php b/templates/html/ApiRenderer.php
index 3fdc35d4..34b617fb 100644
--- a/templates/html/ApiRenderer.php
+++ b/templates/html/ApiRenderer.php
@@ -7,6 +7,7 @@
 
 namespace yii\apidoc\templates\html;
 
+use Highlight\Highlighter;
 use yii\apidoc\helpers\ApiMarkdown;
 use yii\apidoc\models\MethodDoc;
 use yii\apidoc\models\PropertyDoc;
@@ -102,12 +103,16 @@ public function render($context, $targetDir)
         if ($this->controller !== null) {
             Console::startProgress(0, $typeCount, 'Rendering files: ', false);
         }
+
         $done = 0;
+        $higlighter = new Highlighter;
+
         foreach ($types as $type) {
             $fileContent = $this->renderWithLayout($this->typeView, [
                 'type' => $type,
                 'apiContext' => $context,
                 'types' => $types,
+                'highlighter' => $higlighter,
             ]);
             file_put_contents($targetDir . '/' . $this->generateFileName($type->name), $fileContent);
 
diff --git a/templates/html/views/methodDetails.php b/templates/html/views/methodDetails.php
index ae6392d6..72500f7b 100644
--- a/templates/html/views/methodDetails.php
+++ b/templates/html/views/methodDetails.php
@@ -8,6 +8,7 @@
 /* @var $type ClassDoc|TraitDoc */
 /* @var $this yii\web\View */
 /* @var $renderer \yii\apidoc\templates\html\ApiRenderer */
+/* @var $highlighter \Highlight\Highlighter */
 
 $renderer = $this->context;
 
@@ -90,6 +91,25 @@
         <?php endif; ?>
     </table>
 
+    <?php
+    $sourceCode = $method->sourceCode;
+    $collapseId = 'collapse' . ucfirst($method->name);
+    ?>
+
+    <p>
+        <a class="btn btn-link" data-toggle="collapse" href="#<?= $collapseId ?>" role="button" aria-expanded="false"
+           aria-controls="<?= $collapseId ?>">
+            Source code
+        </a>
+    </p>
+    <div class="collapse" id="<?= $collapseId ?>">
+        <div class="card card-body">
+            <pre>
+                <code class="hljs php language-php"><?= $highlighter->highlight('php', $sourceCode)->value ?></code>
+            </pre>
+        </div>
+    </div>
+
     <?= $this->render('@yii/apidoc/templates/html/views/todos', ['doc' => $method]) ?>
 
 <?php endforeach; ?>
diff --git a/templates/html/views/type.php b/templates/html/views/type.php
index 148f37e1..30ad64ef 100644
--- a/templates/html/views/type.php
+++ b/templates/html/views/type.php
@@ -8,6 +8,7 @@
 /* @var $type ClassDoc|InterfaceDoc|TraitDoc */
 /* @var $this yii\web\View */
 /* @var $renderer \yii\apidoc\templates\html\ApiRenderer */
+/* @var $highlighter \Highlight\Highlighter */
 
 $renderer = $this->context;
 ?>
@@ -105,7 +106,7 @@
 <?= $this->render('@yii/apidoc/templates/html/views/constSummary', ['type' => $type]) ?>
 
 <?= $this->render('@yii/apidoc/templates/html/views/propertyDetails', ['type' => $type]) ?>
-<?= $this->render('@yii/apidoc/templates/html/views/methodDetails', ['type' => $type]) ?>
+<?= $this->render('@yii/apidoc/templates/html/views/methodDetails', ['type' => $type, 'highlighter' => $highlighter]) ?>
 <?php if ($type instanceof ClassDoc): ?>
     <?= $this->render('@yii/apidoc/templates/html/views/eventDetails', ['type' => $type]) ?>
 <?php endif; ?>
diff --git a/tests/data/api/animal/Cat.php b/tests/data/api/animal/Cat.php
index 466ade70..20fe38ab 100644
--- a/tests/data/api/animal/Cat.php
+++ b/tests/data/api/animal/Cat.php
@@ -20,7 +20,7 @@ class Cat extends Animal
      */
     public function render()
     {
-        // this method has `@inheritdoc` tag in brackets
+        // this method has `inheritdoc` tag in brackets
         return 'This is a cat';
     }
-}
\ No newline at end of file
+}
diff --git a/tests/data/api/animal/Dog.php b/tests/data/api/animal/Dog.php
index 5960fd57..de2ad0a2 100644
--- a/tests/data/api/animal/Dog.php
+++ b/tests/data/api/animal/Dog.php
@@ -20,7 +20,7 @@ class Dog extends Animal
      */
     public function render()
     {
-        // this method has `@inheritdoc` tag without brackets
+        // this method has `inheritdoc` tag without brackets
         return 'This is a dog';
     }
-}
\ No newline at end of file
+}