diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 8b2d4ce..8039640 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -795,11 +795,12 @@ function system_requirements($phase) {
         'description' => t('The trusted_host_patterns setting is set to allow %trusted_host_patterns', array('%trusted_host_patterns' => join(', ', $trusted_host_patterns))),
       );
     }
   }
 
-  // Check if the Twig C extension is available.
+  // Check if the Twig C extension is available, but not on PHP 7.0 as a version
+  // of the extension does not exist.
   if ($phase == 'runtime' && (version_compare($phpversion, '7.0.0') < 0)) {
     $url = 'http://twig.sensiolabs.org/doc/installation.html#installing-the-c-extension';
     $requirements['twig_c_extension'] = [
       'title' => t('Twig C extension'),
       'severity' => REQUIREMENT_INFO,