diff --git a/docs.json b/docs.json
index e364b4726..cf95c506d 100644
--- a/docs.json
+++ b/docs.json
@@ -44,7 +44,8 @@
               "pages",
               "navigation",
               "themes",
-              "settings/custom-domain"
+              "settings/custom-domain",
+              "settings/custom-404-page"
             ]
           },
           {
@@ -151,7 +152,6 @@
               "guides/changelogs",
               "guides/hidden-pages",
               "settings/broken-links",
-              "settings/custom-404-page",
               "guides/monorepo",
               {
                 "group": "Custom Subdirectory",
diff --git a/settings/custom-404-page.mdx b/settings/custom-404-page.mdx
index 916028a51..e3ced09f9 100644
--- a/settings/custom-404-page.mdx
+++ b/settings/custom-404-page.mdx
@@ -39,3 +39,22 @@ Configure your 404 page in the `errors.404` section of your `docs.json` file:
 <ResponseField name="description" type="string">
   Custom description for the 404 error page. Supports Markdown formatting.
 </ResponseField>
+
+## API Error Response
+
+When a 404 error occurs in API requests, the response now includes additional error details in the response body:
+
+```json
+{
+  "errorType": "",
+  "errorMessage": ""
+}
+```
+
+<ResponseField name="errorType" type="string">
+  The type of error that occurred. This field helps categorize the specific kind of 404 error.
+</ResponseField>
+
+<ResponseField name="errorMessage" type="string">
+  A descriptive message explaining the error. This provides more context about why the resource was not found.
+</ResponseField>