diff --git a/openapi/CHANGELOG.md b/openapi/CHANGELOG.md
index 266bc941..afb1a38c 100644
--- a/openapi/CHANGELOG.md
+++ b/openapi/CHANGELOG.md
@@ -9,7 +9,13 @@
 ### New HTTP API 'GET /control/querylog/export'
 
 * The new `GET /control/querylog/export` HTTP API allows an export of query log
-  items in the CSV file.
+  items in the CSV file.  Example:
+
+```text
+ans_dnssec,ans_rcode,ans_type,ans_value,cached,client_ip,client_id,ecs,elapsed,filter_id,filter_rule,proto,qclass,qname,qtype,reason,time,upstream
+false,NOERROR,A,192.168.1.1,false,127.0.0.1,,,0.097409,,,,IN,example.com,A,Rewrite,2023-01-30T12:21:13.947563+07:00,
+false,NOERROR,A,45.33.2.79,false,127.0.0.1,,,482.967871,,,,IN,test.com,A,NotFilteredNotFound,2022-12-13T12:18:04.964403+07:00,https://dns10.quad9.net:443/dns-query
+```
 
 ### `POST /control/version.json` and `GET /control/dhcp/interfaces` content type
 
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
index 5d63b787..4e871470 100644
--- a/openapi/openapi.yaml
+++ b/openapi/openapi.yaml
@@ -352,8 +352,12 @@
           'description': 'OK.'
           'content':
             'text/csv':
-              schema:
-                type: string
+              'schema':
+                'type': 'string'
+                'example': >
+                  ans_dnssec,ans_rcode,ans_type,ans_value,cached,client_ip,client_id,ecs,elapsed,filter_id,filter_rule,proto,qclass,qname,qtype,reason,time,upstream
+                  false,NOERROR,A,192.168.1.1,false,127.0.0.1,,,0.097409,,,,IN,example.com,A,Rewrite,2023-01-30T12:21:13.947563+07:00,
+                  false,NOERROR,A,45.33.2.79,false,127.0.0.1,,,482.967871,,,,IN,test.com,A,NotFilteredNotFound,2022-12-13T12:18:04.964403+07:00,https://dns10.quad9.net:443/dns-query
   '/stats':
     'get':
       'tags':