diff --git a/src/doc/unstable-book/src/specialization.md b/src/doc/unstable-book/src/specialization.md
index 59f27343b66..efc380df6e1 100644
--- a/src/doc/unstable-book/src/specialization.md
+++ b/src/doc/unstable-book/src/specialization.md
@@ -2,6 +2,8 @@
 
 The tracking issue for this feature is: [#31844]
 
+[#31844]: https://github.com/rust-lang/rust/issues/31844
+
 ------------------------