Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java	(revision 7238)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java	(revision 7239)
@@ -209,5 +209,10 @@
 
             // Severity node
-            DefaultMutableTreeNode severityNode = new DefaultMutableTreeNode(s);
+            DefaultMutableTreeNode severityNode = new DefaultMutableTreeNode(s) {
+                @Override
+                public String toString() {
+                    return super.toString() + " (" + getLeafCount() + ")";
+                }
+            };
             rootNode.add(severityNode);