Index: /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java	(revision 10647)
+++ /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java	(revision 10648)
@@ -3,4 +3,5 @@
 
 import static org.openstreetmap.josm.tools.I18n.tr;
+import static org.openstreetmap.josm.tools.I18n.trn;
 
 import java.awt.Dimension;
@@ -188,5 +189,5 @@
     @Override
     public String getToolTipText() {
-        return noteData.getNotes().size() + " " + tr("Notes");
+        return trn("{0} note", "{0} notes", noteData.getNotes().size(), noteData.getNotes().size());
     }