diff --git a/README.md b/README.md
index 9a3df51..5cd1a3c 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ dns:
   resolver: 9.9.9.9:53
   zones:
     - example.org.
-	- example.com.
+    - example.com.
 ```
 
 ### Running
@@ -89,7 +89,7 @@ systemctl enable --now prometheus-dnssec-exporter
 
 The following metrics are exposed at the `/metrics` HTTP endpoint:
 
-```prom
+```prometheus
 # HELP dnssec_cds_count Number of CDS records present in the zone
 # TYPE dnssec_cds_count gauge
 dnssec_cds_count{parent="ch.",tld="ch.",zone="example.org."} 1