diff --git a/README.discover.well-known b/README.discover.well-known
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+# see: https://docs.nextcloud.com/server/stable/Nextcloud_Server_Administration_Manual.pdf
+
+# 5.12.3 Service Discovery
+#
+# The redirects for CalDAV or CardDAV does not work if Nextcloud is running behind a reverse proxy. 
+# The recommended solution is that your reverse proxy does the redirects.
+#
+# Apache2:
+# ========
+#
+#    RewriteEngine On
+#    RewriteRule ^/\.well-known/carddav https://%{SERVER_NAME}/remote.php/dav/ [R=301,L]
+#    RewriteRule ^/\.well-known/caldav https://%{SERVER_NAME}/remote.php/dav/ [R=301,L]
+#
+#
+# NGINX:
+# ======
+#
+#    location /.well-known/carddav {
+#       return 301 $scheme://$host/remote.php/dav;
+#    }
+#    location /.well-known/caldav {
+#       return 301 $scheme://$host/remote.php/dav;
+#    }
+#    or
+#    rewrite ^/\.well-known/carddav https://$server_name/remote.php/dav/ redirect;
+#    rewrite ^/\.well-known/caldav https://$server_name/remote.php/dav/ redirect;
diff --git a/README.install-signaling-server b/README.install-signaling-server
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+
+
+# ---
+# Nextcloud High Performance Backend für Talk - Einfache Script-Installation
+# ---
+
+# see:
+#  https://apfelcast.com/nextcloud-high-performance-backend-fuer-talk-einfache-script-installation