diff --git a/README.md b/README.md
index 62c2477c..1482fcdd 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Matrix Specification
 
-This repository contains the Matrix Specification, rendered at [spec.matrix.org](http://spec.matrix.org/).
+This repository contains the Matrix Specification. The current release version is rendered at https://spec.matrix.org, while the latest available build of the `main` branch is at https://spec.matrix.org/unstable.
 
 Developers looking to use Matrix should join [#matrix-dev:matrix.org](https://matrix.to/#/#matrix-dev:matrix.org)
 on Matrix for help.
diff --git a/changelogs/internal/newsfragments/1357.clarification b/changelogs/internal/newsfragments/1357.clarification
new file mode 100644
index 00000000..282ef8ca
--- /dev/null
+++ b/changelogs/internal/newsfragments/1357.clarification
@@ -0,0 +1 @@
+Add link to the unstable spec to the README.
\ No newline at end of file