diff --git a/fep/9098/fep-9098.md b/fep/9098/fep-9098.md
index cce8d5e..b9f10bc 100644
--- a/fep/9098/fep-9098.md
+++ b/fep/9098/fep-9098.md
@@ -106,6 +106,8 @@ To prevent [Cross-Site Scripting (XSS)][XSS] attacks, implementers MUST ensure t
 - When HTML content (e.g. `summary`, `content`) is processed, shortcodes are replaced only inside [Text][DOM-Text] nodes.
 - Reserved HTML characters in text are escaped before replacing shortcodes.
 
+The aspect ratio of the image SHOULD be preserved.
+
 ## Implementations
 
 This document is based on implementations of custom emojis in Pleroma, Mastodon, Misskey and Fedibird.