diff --git a/gui/doc/v528/index.html b/gui/doc/v528/index.html
index 7c1f7bed0fda9048c565199f4d9544d77ec1ee6f..2a7028bff87c9441b30edcbfd6862d673887bab4 100644
--- a/gui/doc/v528/index.html
+++ b/gui/doc/v528/index.html
@@ -42,6 +42,7 @@ For this purpose, a new picture button has been added to the file browser plug-i
 Refreshing now checks also if files still exist in the current directory 
 (for the case where files have been deleted by the user or by another application)
 <li> Allow to change graphic properties of an object (e.g. a histogram) in a Root file via the context menu from the browser (by opening a ged editor)
+<li> Size of directories, trees, and objects associated to keys inside Root files, or any kind of browsable object can be displayed in their associated tooltip, as soon as their GetObjectInfo() method returns their size as a long long int formatted in a const char * ("%lld")
 </ul>
 
 <h4>TGSlider</h4>
@@ -49,4 +50,3 @@ Refreshing now checks also if files still exist in the current directory
 <li> Added <tt>SetEnabled(Bool_t)</tt> and <tt>SetState(Bool_t)</tt>, allowing to disable or enable the TGSlider widgets (will be greyed if disabled).
 </ul>
 
-