AWS whitepapers documentation change

Service: whitepapers · 2025-06-13 · Documentation low

File: whitepapers/latest/tagging-best-practices/what-are-tags.md

Summary

Added note about IAM case sensitivity validation for tag keys

Security assessment

Adds security-adjacent documentation about IAM tag validation to prevent misconfigurations, but does not address a specific security vulnerability

Diff

diff --git a/whitepapers/latest/tagging-best-practices/what-are-tags.md b/whitepapers/latest/tagging-best-practices/what-are-tags.md
index bf6819878..4debb7b92 100644
--- a//whitepapers/latest/tagging-best-practices/what-are-tags.md
+++ b//whitepapers/latest/tagging-best-practices/what-are-tags.md
@@ -67,0 +68,4 @@ Tags are simple and flexible. Both the key and the value of the tag are variabl
+###### Note
+
+Although tag keys are case sensitive, IAM has additional validations for IAM resources to prevent the application of tag keys that only differ in casing. We recommend not using keys that only differ in casing. Refer to [Tags for IAM resources](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_tags.html#id_tags_rules) for more details.
+