diff --git a/UPGRADING b/UPGRADING
index 94b272c69c70..cc1ff9938ad5 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -935,6 +935,7 @@ PHP 8.5 UPGRADE NOTES
   . T_PIPE.
 
 - Standard:
+  . IMAGETYPE_HEIF.
   . IMAGETYPE_SVG when libxml is loaded.
 
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