diff --git a/doc/syntax.md b/doc/syntax.md
index d1f8d2fc5c..df0ec10986 100644
--- a/doc/syntax.md
+++ b/doc/syntax.md
@@ -24,7 +24,7 @@ both programmers and proof engineers alike.
 
 TODO. See [Lean Together 2021: Metaprogramming in Lean
 4](https://youtu.be/hxQ1vvhYN_U) for an overview as well [the
-continuation](https://youtu.be/hxQ1vvhYN_U) about tactic programming.
+continuation](https://youtu.be/vy4JWIiiXSY) about tactic programming.
 For more information on antiquotations, see also §4.1 of [Beyond
 Notations: Hygienic Macro Expansion for Theorem Proving
 Languages](https://arxiv.org/pdf/2001.10490.pdf#page=11).