diff --git a/howto/prometheus.md b/howto/prometheus.md
index 625d717ad41f824361251a6ab649a5372ebf49c8..c6897d3591afb516513db74ae8f48237157b27ad 100644
--- a/howto/prometheus.md
+++ b/howto/prometheus.md
@@ -1421,7 +1421,7 @@ would otherwise be around long enough for Prometheus to scrape their
 metrics. We use it as a workaround to bridge Metrics data with
 Prometheus/Grafana.
 
-### Blackbox exporter
+## Blackbox exporter
 
 Most exporters are pretty straightforward: a service binds to a port and exposes
 metrics through HTTP requests on that port, generally on the `/metrics` URL.