diff --git a/nodes/qzwi.toml b/nodes/qzwi.toml
index 08be668..ef0b168 100644
--- a/nodes/qzwi.toml
+++ b/nodes/qzwi.toml
@@ -34,6 +34,8 @@ gateway6 = "2a00:f820:528::1"
 "NextCloud" = "https://cloud.qzwi.de/"
 
 [metadata.nextcloud]
+# for elasticsearch to work, please install 'ingest-attachment' plugin:
+# /usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment
 domain = "cloud.qzwi.de"
 sha1 = "0d496eb0808c292502479e93cd37fe2daf95786a"
 version = "23.0.0"