diff --git a/README.md b/README.md
index e095d8c..62d6b94 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,16 @@
 **HS instance: envs.net**
 
 more informations on https://envs.net/chat/matrix/
+
+## useful documentations
+
+[synapse INSTALL.md](https://github.com/matrix-org/synapse/blob/master/docs/setup/installation.md)
+[synapse default homeserver.yaml](https://github.com/matrix-org/synapse/blob/master/docs/sample_config.yaml)
+
+[synapse-delagate](https://github.com/matrix-org/synapse/blob/master/docs/delegate.md)
+[synapse-workers](https://github.com/matrix-org/synapse/blob/master/docs/workers.md)
+
+[synapse admin API](https://github.com/matrix-org/synapse/tree/master/docs/admin_api)
+
+[matrix-synchrotron-balancer](https://github.com/Sorunome/matrix-synchrotron-balancer)
+[matrix-media-repo](https://github.com/turt2live/matrix-media-repo)