diff --git a/core/modules/aggregator/aggregator.install b/core/modules/aggregator/aggregator.install
index e236628..75ef17e 100644
--- a/core/modules/aggregator/aggregator.install
+++ b/core/modules/aggregator/aggregator.install
@@ -5,6 +5,8 @@
  * Install, update and uninstall functions for the aggregator module.
  */
 
+use Drupal\Core\Url;
+
 /**
  * Implements hook_requirements().
  */
@@ -17,7 +19,7 @@ function aggregator_requirements($phase) {
   );
   if (!$has_curl) {
     $requirements['curl']['severity'] = REQUIREMENT_ERROR;
-    $requirements['curl']['description'] = t('The Aggregator module could not be installed because the PHP <a href="http://php.net/manual/curl.setup.php">cURL</a> library is not available.');
+    $requirements['curl']['description'] = t('The Aggregator module requires the <a href="http://php.net/manual/curl.setup.php">PHP cURL library</a>. You can check your PHP configuration via the <a href="@phpinfo_url">phpinfo() page</a>. For instructions on how install the cURL library, see <a href="https://www.drupal.org/requirements/php/curl">Install the PHP cURL extension</a>.', array('@phpinfo_url' => (new Url('system.php'))->toString()));
   }
   return $requirements;
 }
diff --git a/core/modules/simpletest/simpletest.install b/core/modules/simpletest/simpletest.install
index e5eb9a3..9ebbb40 100644
--- a/core/modules/simpletest/simpletest.install
+++ b/core/modules/simpletest/simpletest.install
@@ -6,6 +6,7 @@
  */
 
 use Drupal\Component\Utility\Environment;
+use Drupal\Core\Url;
 
 /**
  * Minimum value of PHP memory_limit for SimpleTest.
@@ -27,7 +28,7 @@ function simpletest_requirements($phase) {
   );
   if (!$has_curl) {
     $requirements['curl']['severity'] = REQUIREMENT_ERROR;
-    $requirements['curl']['description'] = t('The testing framework could not be installed because the PHP <a href="http://php.net/manual/curl.setup.php">cURL</a> library is not available.');
+    $requirements['curl']['description'] = t('The testing framework requires the <a href="http://php.net/manual/curl.setup.php">PHP cURL library</a>. You can check your PHP configuration via the <a href="@phpinfo_url">phpinfo() page</a>. For instructions on how install the cURL library, see <a href="https://www.drupal.org/requirements/php/curl">Install the PHP cURL extension</a>.', array('@phpinfo_url' => (new Url('system.php'))->toString()));
   }
 
   // SimpleTest currently needs 2 cURL options which are incompatible with