# Document history
<a name="doc-history"></a>

The following table describes significant changes to this guide. 


| 
| 
| **Change** | **Description** | **Date** | 
| --- |--- |--- |
| Updated section | Updated the [Load balancer subnets and routing](subnets-routing.md) section with new diagrams and clarifications. | July 5, 2024 | 
| Updates and corrections | Updated the code, diagrams, and examples. | May 31, 2023 | 
| Updated sections | Updated the *How it works* sections in [Target group stickiness](target-group-stickiness.md) and [Sticky sessions with load balancer generated cookies](alb-cookies-stickiness.md) to provide more accurate and detailed information. | July 18, 2022 | 
| Initial publication | — | August 5, 2021 |