diff --git a/alert-rules.md b/alert-rules.md
index 4b2ca651552fc..fbad805bf417a 100644
--- a/alert-rules.md
+++ b/alert-rules.md
@@ -230,7 +230,7 @@ This section gives the alert rules for the PD component.
 
 * Alert rule:
 
-    `(sum(pd_regions_status{type="miss_peer_region_count"}) by (instance) > 100) and (sum(etcd_server_is_leader) by (instance) > 0)`
+    `(sum(pd_regions_status{type="miss-peer-region-count"}) by (instance) > 100) and (sum(etcd_server_is_leader) by (instance) > 0)`
 
 * Description:
 
@@ -239,7 +239,7 @@ This section gives the alert rules for the PD component.
 * Solution:
 
     * Find the cause of the issue by checking whether there is any TiKV machine that is down or being made offline.
-    * Watch the Region health panel and see whether `miss_peer_region_count` is continuously decreasing.
+    * Watch the Region health panel and see whether `miss-peer-region-count` is continuously decreasing.
 
 ### Warning-level alerts