diff --git a/core/lib/Drupal/Core/Template/TwigEnvironment.php b/core/lib/Drupal/Core/Template/TwigEnvironment.php
index 0416d1e..6b21282 100644
--- a/core/lib/Drupal/Core/Template/TwigEnvironment.php
+++ b/core/lib/Drupal/Core/Template/TwigEnvironment.php
@@ -211,6 +211,11 @@ public function getTemplateClass($name, $index = NULL, $inline = FALSE) {
   /**
    * Renders a twig string directly.
    *
+   * Warning: You should use the render element 'twig_inline' together with
+   * the #template attribute instead of this method directly.
+   * On top of that you have to ensure that the template string is not dynamic
+   * but just an ordinary static php string.
+   *
    * @param string $template_string
    *   The template string to render with placeholders.
    * @param array $context