diff --git a/core/modules/help/help.api.php b/core/modules/help/help.api.php
index 6bfe106..ed2dd0c 100644
--- a/core/modules/help/help.api.php
+++ b/core/modules/help/help.api.php
@@ -58,7 +58,7 @@ function hook_help($route_name, \Drupal\Core\Routing\RouteMatchInterface $route_
 /**
  * Perform alterations on help page section plugin definitions.
  *
- * Sections for the admin/help page are provided by plugins. This hook allows
+ * Sections for the page at admin/help are provided by plugins. This hook allows
  * modules to alter the plugin definitions.
  *
  * @param array $info
diff --git a/core/modules/tour/src/Plugin/HelpSection/TourHelpSection.php b/core/modules/tour/src/Plugin/HelpSection/TourHelpSection.php
index 7c7670f..9ef44e3 100644
--- a/core/modules/tour/src/Plugin/HelpSection/TourHelpSection.php
+++ b/core/modules/tour/src/Plugin/HelpSection/TourHelpSection.php
@@ -99,8 +99,15 @@ public function listTopics() {
       $routes = $entity->getRoutes();
       $made_link = FALSE;
       foreach ($routes as $route) {
-        // Some routes require parameters, and will generate exceptions. Use
-        // a try/catch loop to skip over these ones to find one that will work.
+        // Some tours are for routes with parameters. For instance, there is
+        // currently a tour in the Language module for the language edit page,
+        // which appears on all pages with URLs like:
+        // /admin/config/regional/language/edit/LANGCODE.
+        // There is no way to make a link to the page that displays the tour,
+        // because it is a set of pages. The easiest way to detect this is to
+        // use a try/catch exception -- try to make a link, and it will error
+        // out with a missing parameter exception if the route leads to a set
+        // of pages instead of a single page.
         try {
           $params = isset($route['route_params']) ? $route['route_params'] : [];
           $url = Url::fromRoute($route['route_name'], $params);