--- ./app/code/core/Mage/Catalog/etc/api.xml.old	2011-08-11 15:56:47.000000000 +0200
+++ ./app/code/core/Mage/Catalog/etc/api.xml	2011-08-11 15:54:27.000000000 +0200
@@ -292,6 +292,10 @@
                         <title>Remove product image</title>
                         <acl>catalog/product/media/remove</acl>
                     </remove>
+                    <md5 translate="title" module="catalog">
+                        <title>Retrieve product image md5sum</title>
+                        <acl>catalog/product/media/md5</acl>
+                    </md5>
                 </methods>
                 <faults module="catalog">
                     <store_not_exists>