diff --git a/SECURITY.md b/SECURITY.md
index 04567baf07..19f5f2eea2 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -7,6 +7,11 @@ bug report to the GitHub repository.
 
 Thanks for helping make Misskey safe for everyone.
 
+> [!note]
+> CNA [requires](https://www.cve.org/ResourcesSupport/AllResources/CNARules#section_5-2_Description) that CVEs include a description in English for inclusion in the CVE Catalog.
+> 
+> When creating a security advisory, all content must be written in English (it is acceptable to include a non-English description along with the English one).
+
 ## When create a patch
 
 If you can also create a patch to fix the vulnerability, please create a PR on the private fork.