diff --git a/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
index b1f7c2aea4d91f023156de0c32066fcbceb6a1db..9fc7053167c351c4ea94739f41f91029b438296b 100644
--- a/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -158,24 +158,9 @@ public function renderPlain(&$elements) {
   }
 
   /**
-   * Renders final HTML for a placeholder.
-   *
-   * Renders the placeholder in isolation.
-   *
-   * @param string $placeholder
-   *   An attached placeholder to render. (This must be a key of one of the
-   *   values of $elements['#attached']['placeholders'].)
-   * @param array $elements
-   *   The structured array describing the data to be rendered.
-   *
-   * @return array
-   *   The updated $elements.
-   *
-   * @see ::replacePlaceholders()
-   *
-   * @todo Make public as part of https://www.drupal.org/node/2469431
+   * {@inheritdoc}
    */
-  protected function renderPlaceholder($placeholder, array $elements) {
+  public function renderPlaceholder($placeholder, array $elements) {
     // Get the render array for the given placeholder
     $placeholder_elements = $elements['#attached']['placeholders'][$placeholder];
 
@@ -196,7 +181,6 @@ protected function renderPlaceholder($placeholder, array $elements) {
     return $elements;
   }
 
-
   /**
    * {@inheritdoc}
    */
@@ -647,6 +631,8 @@ protected function setCurrentRenderContext(RenderContext $context = NULL) {
    *
    * @returns bool
    *   Whether placeholders were replaced.
+   *
+   * @see \Drupal\Core\Render\Renderer::renderPlaceholder()
    */
   protected function replacePlaceholders(array &$elements) {
     if (!isset($elements['#attached']['placeholders']) || empty($elements['#attached']['placeholders'])) {
diff --git a/core/lib/Drupal/Core/Render/RendererInterface.php b/core/lib/Drupal/Core/Render/RendererInterface.php
index 317ded374f59c7796c7167b1f2d791a4144d7ac1..3cd1ff0638278eaf578053b9b73bb2f0be1ebb6a 100644
--- a/core/lib/Drupal/Core/Render/RendererInterface.php
+++ b/core/lib/Drupal/Core/Render/RendererInterface.php
@@ -33,7 +33,7 @@ interface RendererInterface {
    * @throws \LogicException
    *   When called from inside another renderRoot() call.
    *
-   * @see ::render()
+   * @see \Drupal\Core\Render\RendererInterface::render()
    */
   public function renderRoot(&$elements);
 
@@ -61,11 +61,29 @@ public function renderRoot(&$elements);
    * @return \Drupal\Component\Render\MarkupInterface
    *   The rendered HTML.
    *
-   * @see ::renderRoot()
-   * @see ::render()
+   * @see \Drupal\Core\Render\RendererInterface::renderRoot()
+   * @see \Drupal\Core\Render\RendererInterface::render()
    */
   public function renderPlain(&$elements);
 
+  /**
+   * Renders final HTML for a placeholder.
+   *
+   * Renders the placeholder in isolation.
+   *
+   * @param string $placeholder
+   *   An attached placeholder to render. (This must be a key of one of the
+   *   values of $elements['#attached']['placeholders'].)
+   * @param array $elements
+   *   The structured array describing the data to be rendered.
+   *
+   * @return array
+   *   The updated $elements.
+   *
+   * @see \Drupal\Core\Render\RendererInterface::render()
+   */
+  public function renderPlaceholder($placeholder, array $elements);
+
   /**
    * Renders HTML given a structured array tree.
    *
@@ -317,7 +335,7 @@ public function renderPlain(&$elements);
    * @see \Drupal\Core\Theme\ThemeManagerInterface::render()
    * @see drupal_process_states()
    * @see \Drupal\Core\Render\AttachmentsResponseProcessorInterface::processAttachments()
-   * @see ::renderRoot()
+   * @see \Drupal\Core\Render\RendererInterface::renderRoot()
    */
   public function render(&$elements, $is_root_call = FALSE);