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AWS AmazonECS documentation change

Service: AmazonECS · 2026-07-04 · Documentation low

File: AmazonECS/latest/developerguide/express-service-advanced-customization.md

Summary

Updated link format and added documentation about using custom task definitions for sidecar containers

Security assessment

Change improves documentation clarity and adds instructions for sidecar containers. No security vulnerabilities or security-specific features are mentioned.

Diff

diff --git a/AmazonECS/latest/developerguide/express-service-advanced-customization.md b/AmazonECS/latest/developerguide/express-service-advanced-customization.md
index 8e1fe16fb..efca5c13e 100644
--- a//AmazonECS/latest/developerguide/express-service-advanced-customization.md
+++ b//AmazonECS/latest/developerguide/express-service-advanced-customization.md
@@ -17 +17 @@ The responsibility boundary in Express Mode is defined by API usage. Express Mod
-For more details on the defaults that Express Mode sets and the resources that it orchestrates, see [Resources created by Amazon ECS Express Mode services](AmazonECS/latest/developerguide/express-service-work.html).
+For more information about the defaults that Express Mode sets and the resources it orchestrates, see [Resources created by Amazon ECS Express Mode services](./express-service-work.html).
@@ -28,0 +29,4 @@ You can add any sidecar container to your service. This example shows how to add
+You can define a task definition with sidecar containers and provide it to your Express Mode service using the `taskDefinitionArn` parameter. Express Mode uses your task definition as-is, including any sidecar containers you configured. For more information, see [Create an Express Mode service with your own task definition](./express-service-getting-started.html#express-service-create-byotd).
+
+Alternatively, you can add a sidecar by editing the Express Mode created task definition directly, as described in the following procedure.
+