diff --git a/src/doc/guide-tasks.md b/src/doc/guide-tasks.md
index 197559bef04..21217bf54d7 100644
--- a/src/doc/guide-tasks.md
+++ b/src/doc/guide-tasks.md
@@ -1,4 +1,4 @@
 % The (old) Rust Threads and Communication Guide
 
 This content has moved into
-[the Rust Programming Language book](book/tasks.html).
+[the Rust Programming Language book](book/concurrency.html).