diff --git a/appendices/migration85/constants.xml b/appendices/migration85/constants.xml
index 0b8a86d31536..57ab491216dc 100644
--- a/appendices/migration85/constants.xml
+++ b/appendices/migration85/constants.xml
@@ -160,6 +160,9 @@
   <title>Standard</title>
 
   <simplelist>
+   <member>
+    <constant>IMAGETYPE_HEIF</constant>
+   </member>
    <member>
     <constant>IMAGETYPE_SVG</constant>
     when libxml is loaded.
diff --git a/reference/image/constants.xml b/reference/image/constants.xml
index 69b5555fbd2f..2c220c056861 100644
--- a/reference/image/constants.xml
+++ b/reference/image/constants.xml
@@ -701,6 +701,18 @@
     </simpara>
    </listitem>
   </varlistentry>
+  <varlistentry xml:id="constant.imagetype-heif">
+   <term>
+    <constant>IMAGETYPE_HEIF</constant>
+    (<type>int</type>)
+   </term>
+   <listitem>
+    &gd.constants.type;
+    <simpara>
+     (Available as of PHP 8.5.0)
+    </simpara>
+   </listitem>
+  </varlistentry>
   <varlistentry xml:id="constant.imagetype-unknown">
    <term>
     <constant>IMAGETYPE_UNKNOWN</constant>