diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index f14f372cf6f5e0706e1ba94490c6c57a1aaf6d41..467d5940f62406c35ab64fb7c4c88b1556154fa0 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -77,6 +77,7 @@ void wakeme_after_rcu(struct rcu_head  *head)
  * sections are delimited by rcu_read_lock() and rcu_read_unlock(),
  * and may be nested.
  */
+void synchronize_rcu(void);	/* Makes kernel-doc tools happy */
 synchronize_rcu_xxx(synchronize_rcu, call_rcu)
 EXPORT_SYMBOL_GPL(synchronize_rcu);