diff --git a/docs/README.md b/docs/README.md
index 08ce6096d..b4e6d5c81 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -121,6 +121,7 @@ This documentation covers the installation, configuration, and usage of Dokku -
 
 ### Migration Guides
 
+- [0.38.0](appendices/0.38.0-migration-guide.md)
 - [0.37.0](appendices/0.37.0-migration-guide.md)
 - [0.36.0](appendices/0.36.0-migration-guide.md)
 - [0.35.0](appendices/0.35.0-migration-guide.md)
diff --git a/docs/appendices/0.38.0-migration-guide.md b/docs/appendices/0.38.0-migration-guide.md
new file mode 100644
index 000000000..e547325ec
--- /dev/null
+++ b/docs/appendices/0.38.0-migration-guide.md
@@ -0,0 +1,15 @@
+# 0.38.0 Migration Guide
+
+## Changes
+
+- Dokku now generates a minimal nginx configuration for apps without running `web` processes (undeployed apps, apps with no `web` process type, or apps with stopped web processes). This configuration returns `502 Bad Gateway` responses, ensuring the app's domain resolves and monitoring tools can detect non-200 status codes. The configuration is automatically replaced with the full proxy configuration once the app is deployed with running `web` processes. See the [nginx documentation](/docs/networking/proxies/nginx.md#nginx-configuration-for-undeployed-apps) for more details.
+- Users with custom `nginx.conf.sigil` templates that reference `DOKKU_APP_WEB_LISTENERS` should be aware that this variable may now be empty when the template is rendered for apps without running web processes. Custom templates should handle this case gracefully, for example by using a conditional to serve an error page instead of proxying:
+    ```
+    location / {
+    {{ if $.DOKKU_APP_WEB_LISTENERS }}
+      proxy_pass  http://{{ $.APP }}-{{ $upstream_port }};
+    {{ else }}
+      return 502;
+    {{ end }}
+    }
+    ```