diff --git a/README.txt b/README.txt
index 98032d2836519fa726e7427438dab4019d0f8c88..240358c0d094db2f83c709ae60ddc3430fc92ab3 100644
--- a/README.txt
+++ b/README.txt
@@ -97,19 +97,14 @@ without enabling the Memcache lock implementation can cause worse performance.
 Only change the following values if you're sure you know what you're doing,
 which requires reading the memcachie.inc code.
 
-The value passed to lock_acquire, defaults to '15':
-  $conf['memcache_stampede_semaphore'] = 15;
+The value passed to Drupal\Core\Lock\LockBackendInterface::wait(), defaults to 5:
+  $settings['memcache']['stampede_wait_time'] = 5;
 
-The value passed to lock_wait, defaults to 5:
-  $conf['memcache_stampede_wait_time'] = 5;
-
-The maximum number of calls to lock_wait() due to stampede protection during a
-single request, defaults to 3:
-  $conf['memcache_stampede_wait_limit'] = 3;
+The maximum number of calls to Drupal\Core\Lock\LockBackendInterface::wait() due
+to stampede protection during a single request, defaults to 3:
+  $settings['memcache']['stampede_wait_limit'] = 3;
 
 When adjusting these variables, be aware that:
- - there is unlikely to be a good use case for setting wait_time higher
-   than stampede_semaphore;
  - wait_time * wait_limit is designed to default to a number less than
    standard web server timeouts (i.e. 15 seconds vs. apache's default of
    30 seconds).