diff --git a/docs/timeline.md b/docs/timeline.md
index 3473f03f2f..58190f0fb0 100644
--- a/docs/timeline.md
+++ b/docs/timeline.md
@@ -118,3 +118,5 @@ In reverse chronological order, with most recent events first.
 > </div>
 
 <!-- markdownlint-restore -->
+
+[1]: https://docs.google.com/document/d/1adG2pXuMXI0wPbR_09ASORMx2gcVn0H6nsCNNGG7tpM/edit#heading=h.k45v77hc1cu1