diff --git a/monitoring/README.md b/monitoring/README.md
index c7c2ac3..ca3e1bc 100644
--- a/monitoring/README.md
+++ b/monitoring/README.md
@@ -32,6 +32,10 @@ Sample queries:
 * [Disk space left](https://prom.k-space.ee/graph?g0.range_input=1h&g0.expr=node_filesystem_avail_bytes&g0.tab=1)
 * Minio [s3 egress](https://prom.k-space.ee/graph?g0.expr=rate(minio_s3_traffic_sent_bytes%5B3m%5D)&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h), [internode egress](https://prom.k-space.ee/graph?g0.expr=rate(minio_inter_node_traffic_sent_bytes%5B2m%5D)&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h), [storage used](https://prom.k-space.ee/graph?g0.expr=minio_node_disk_used_bytes&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h)
 
+Another useful tool for exploring Prometheus operator custom resources is
+[doc.crds.dev/github.com/prometheus-operator/prometheus-operator]
+(https://doc.crds.dev/github.com/prometheus-operator/prometheus-operator@v0.75.0)
+
 # For administrators
 
 To reconfigure SNMP targets etc: