diff -u b/core/includes/common.inc b/core/includes/common.inc
--- b/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -7308,15 +7308,15 @@
  * @see hook_cache_flush()
  * @see hook_rebuild()
  *
- * @todo This functions resets all static caches. The theme is not initialized
+ * @todo This function resets all static caches. The theme is not initialized
  *   anymore and all previously added JavaScript and CSS is gone. But since that
  *   is the whole point of this function, all callers need to take care for
  *   backing up needed variables and properly re-initializing the theme on their
  *   own. See install_finished() for an example. Normally, this function is
- *   called as a end of POST request operation that is followed by a redirect
+ *   called as an end of POST request operation that is followed by a redirect
  *   though.
  * @todo Try to separate page/JS/CSS caches so cached pages can be served during
- *   this possibly long-running operation. (Conflict on bootstrap though.)
+ *   this possibly long-running operation. (Conflict on bootstrap cache though.)
  * @todo Add a global lock to ensure that caches are not primed in concurrent
  *   requests.
  */
diff -u b/core/modules/system/system.api.php b/core/modules/system/system.api.php
--- b/core/modules/system/system.api.php
+++ b/core/modules/system/system.api.php
@@ -2120,10 +2120,10 @@
  * module data. It runs after hook_cache_flush() and after all module data has
  * been updated.
  *
- * This hook is only invoked after the system has been completely
- * "re-initialized"; i.e., all previously cached data is known to be gone and
- * every API in the system is known to return current information, so your
- * module can safely rely on all available data to rebuild its own.
+ * This hook is only invoked after the system has been completely cleared;
+ * i.e., all previously cached data is known to be gone and every API in the
+ * system is known to return current information, so your module can safely rely
+ * on all available data to rebuild its own.
  *
  * @see hook_cache_flush()
  * @see drupal_flush_all_caches()