diff --git a/build/docker/config/dendrite-config.yaml b/build/docker/config/dendrite-config.yaml
index 94dcd992d..3d6c56afa 100644
--- a/build/docker/config/dendrite-config.yaml
+++ b/build/docker/config/dendrite-config.yaml
@@ -91,6 +91,17 @@ global:
       username: metrics
       password: metrics
 
+  # DNS cache options. The DNS cache may reduce the load on DNS servers
+  # if there is no local caching resolver available for use.
+  dns_cache:
+    # Whether or not the DNS cache is enabled.
+    enabled: false
+
+    # Maximum number of entries to hold in the DNS cache, and
+    # for how long those items should be considered valid.
+    cache_size: 256
+    cache_lifetime: 600
+
 # Configuration for the Appservice API.
 app_service_api:
   internal_api:
diff --git a/dendrite-config.yaml b/dendrite-config.yaml
index 978b18008..971e3cf06 100644
--- a/dendrite-config.yaml
+++ b/dendrite-config.yaml
@@ -103,6 +103,17 @@ global:
       username: metrics
       password: metrics
 
+  # DNS cache options. The DNS cache may reduce the load on DNS servers
+  # if there is no local caching resolver available for use.
+  dns_cache:
+    # Whether or not the DNS cache is enabled.
+    enabled: false
+
+    # Maximum number of entries to hold in the DNS cache, and
+    # for how long those items should be considered valid.
+    cache_size: 256
+    cache_lifetime: 600
+
 # Configuration for the Appservice API.
 app_service_api:
   internal_api: