diff --git a/docs/reference/services/tempo.md b/docs/reference/services/tempo.md
index 0050714..567168a 100644
--- a/docs/reference/services/tempo.md
+++ b/docs/reference/services/tempo.md
@@ -46,6 +46,16 @@ Beyla auto-instruments HTTP services via eBPF kernel hooks — no code changes n
 **Future: SDK instrumentation**
 Services with OTel SDK support (e.g., Hermes) can send traces directly to the OTLP endpoint for deeper internal spans (DB queries, business logic) alongside eBPF envelope traces.
 
+## Storage Monitoring
+
+Tempo exposes `tempodb_backend_bytes_total` via its `/metrics` endpoint (scraped by [[prometheus]]). To check storage utilization against the 10Gi PVC:
+
+```promql
+tempodb_backend_bytes_total / 10737418240 * 100
+```
+
+Full PVC-level monitoring (via kubelet volume stats) is not yet available — see backlog.
+
 ## Grafana Integration
 
 - **Tempo datasource** with trace-to-log and trace-to-metrics correlation