Add documentation for new dns cache parameters

website/source/docs/agent/options.html.md

@@ -1072,6 +1072,12 @@ default will automatically work with some tooling.
         Configures the Retry duration expressed in seconds, default value is
         600, ie: 10 minutes.
 
+    * <a name="dns_use_cache"></a><a href="dns_use_cache">`use_cache`</a> - When set to true, DNS resolution will use the agent cache described
+      in [agent caching](/api/index.html#agent-caching). This setting affects all service and prepared queries DNS requests. Implies [`allow_stale`](#allow_stale)
+
+    * <a name="dns_cache_max_age"></a><a href="dns_cache_max_age">`dns_max_age`</a> - When [use_cache](#dns_use_cache) is enabled, the agent
+      will attempt to re-fetch the result from the servers if the cached value is older than this duration. See: [agent caching](/api/index.html#agent-caching).
+
 * <a name="domain"></a><a href="#domain">`domain`</a> Equivalent to the
   [`-domain` command-line flag](#_domain).