diff --git a/core/includes/common.inc b/core/includes/common.inc
index d21b9ce..d040457 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -111,8 +111,7 @@ const HTTP_REQUEST_TIMEOUT = -1;
  * Modules specify the caching patterns for their blocks using binary
  * combinations of these constants in their hook_block_info().
  * DRUPAL_CACHE_PER_ROLE is used as a default when no caching pattern is
- * specified. Use DRUPAL_CACHE_CUSTOM to disable standard block cache and
- * implement
+ * specified.
  *
  * The block cache is cleared when the 'content' cache tag is invalidated,
  * following the same pattern as the page cache (node, comment, user, taxonomy
@@ -137,9 +136,8 @@ const DRUPAL_NO_CACHE = -1;
 /**
  * The block is handling its own caching in its hook_block_view().
  *
- * From the perspective of the block cache system, this is equivalent to
- * DRUPAL_NO_CACHE. Useful when time based expiration is needed or a site uses
- * a node access which invalidates standard block cache.
+ * This settings is seful when time based expiration is needed or a site uses a
+ * node access which invalidates standard block cache.
  */
 const DRUPAL_CACHE_CUSTOM = -2;