diff --git a/src/freedombone-app-synapse b/src/freedombone-app-synapse
index 875f1680..d0555d42 100755
--- a/src/freedombone-app-synapse
+++ b/src/freedombone-app-synapse
@@ -12,6 +12,11 @@
 #
 # https://matrix.org/blog/2016/02/10/advanced-synapse-setup-with-lets-encrypt/
 #
+# Had no success in configuring this with Riot, and the identity server
+# turned out to be centralised.
+#   https://github.com/matrix-org/matrix-doc/issues/712
+# Possibly it might become decentralised in future.
+#
 # License
 # =======
 #