diff --git a/knowledge base/cloud computing/aws/s3.md b/knowledge base/cloud computing/aws/s3.md
index da1c646..2ee803c 100644
--- a/knowledge base/cloud computing/aws/s3.md	
+++ b/knowledge base/cloud computing/aws/s3.md	
@@ -99,6 +99,7 @@ Examples: [1][lifecycle  configuration examples], [2][s3 lifecycle rules example
 
 - [Configure notification for lifecycle rules][lifecycle  configure notification]
 - AWS' [CLI]
+- [Expiring Amazon S3 objects based on last accessed date to decrease costs]
 
 ### Sources
 
@@ -119,6 +120,7 @@ Examples: [1][lifecycle  configuration examples], [2][s3 lifecycle rules example
 
 <!-- Upstream -->
 [cli subcommand reference]: https://docs.aws.amazon.com/cli/latest/reference/s3/
+[expiring amazon s3 objects based on last accessed date to decrease costs]: https://aws.amazon.com/blogs/architecture/expiring-amazon-s3-objects-based-on-last-accessed-date-to-decrease-costs/
 [lifecycle  configuration examples]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/lifecycle-configuration-examples.html
 [lifecycle  configure notification]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/lifecycle-configure-notification.html
 [lifecycle  general considerations for transitions]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/lifecycle-transition-general-considerations.html