Convert ACME docs to md

1 files changed, 1 insertions, 1 deletions

diff --git a/UPGRADE.rst b/UPGRADE.rst

index 74d2452749..948867f189 100644
--- a/UPGRADE.rst
+++ b/UPGRADE.rst
@@ -54,7 +54,7 @@ Upgrading to v0.99.0
 No special steps are required, but please be aware that you will need to
 replace any self-signed certificates with those verified by a root CA before
 Synapse v1.0 releases in roughly a month's time after v0.99.0. Information on
-how to do so can be found at `the ACME docs <docs/ACME.rst>`_.
+how to do so can be found at `the ACME docs <docs/ACME.md>`_.
 
 Upgrading to v0.34.0
 ====================