diff --git a/docs/node-mixin/README.md b/docs/node-mixin/README.md
index 489b599c..0432d354 100644
--- a/docs/node-mixin/README.md
+++ b/docs/node-mixin/README.md
@@ -39,6 +39,9 @@ for Grafana:
 $ make dashboards_out
 ```
 
+Note that some of the generated dashboards require recording rules specified in
+the previously generated `node_rules.yaml`.
+
 For more advanced uses of mixins, see
 https://github.com/monitoring-mixins/docs.