diff --git a/core/includes/pager.inc b/core/includes/pager.inc
index 9892de0..e25c328 100644
--- a/core/includes/pager.inc
+++ b/core/includes/pager.inc
@@ -186,7 +186,7 @@ function template_preprocess_pager(&$variables) {
   $tags = &$variables['tags'];
   $tags += array(
     t('« first'),
-    t('‹ prev'),
+    t('‹ previous'),
     '',
     t('next ›'),
     t('last »'),
diff --git a/core/modules/comment/src/Tests/CommentPagerTest.php b/core/modules/comment/src/Tests/CommentPagerTest.php
index 4faf991..69e471d 100644
--- a/core/modules/comment/src/Tests/CommentPagerTest.php
+++ b/core/modules/comment/src/Tests/CommentPagerTest.php
@@ -349,11 +349,10 @@ function testTwoPagers() {
   }
 
   /**
-   * Follows a link by xpath.
+   * Follows a link found at a give xpath query.
    *
-   * Will click the first link found with this link text by default, or a later
-   * one if an index is given. Match is case sensitive with normalized space.
-   * The label is translated label.
+   * Will click the first link found with the given xpath query by default,
+   * or a later one if an index is given.
    *
    * If the link is discovered and clicked, the test passes. Fail otherwise.
    *
diff --git a/core/modules/system/templates/pager.html.twig b/core/modules/system/templates/pager.html.twig
index d034738..3397739 100644
--- a/core/modules/system/templates/pager.html.twig
+++ b/core/modules/system/templates/pager.html.twig
@@ -5,6 +5,25 @@
  *
  * Available variables:
  * - items: List of pager items.
+ *   The list is keyed by the following elements:
+ *   - first: Item for the first page; not present on the first page of results.
+ *   - previous: Item for the previous page; not present on the first page
+ *     of results.
+ *   - next: Item for the next page; not present on the last page of results.
+ *   - last: Item for the last page; not present on the last page of results.
+ *   - pages: List of pages, keyed by page numer.
+ *   - current: The page number of the current page.
+ *   - ellipsis: If there are more pages than the quantity allows, then an
+ *     ellipsis before or after the listed pages may be present.
+ *
+ *   Special case sub-sub-elements:
+ *
+ *   items.first, items.previous, items.next, items.last and each item inside
+ *   items.pages contain the following elements:
+ *     - href: URL with appropriate query parameters for the item.
+ *     - attributes: A keyed list of HTML attributes for the item.
+ *     - text: The visible text used for the item link, such as "‹ previous"
+ *       or "next ›".
  *
  * @see template_preprocess_pager()
  *