Index: trunk/src_plugins/lib_gtk_common/wt_layersel.c
===================================================================
--- trunk/src_plugins/lib_gtk_common/wt_layersel.c	(revision 8936)
+++ trunk/src_plugins/lib_gtk_common/wt_layersel.c	(revision 8937)
@@ -529,6 +529,7 @@
 		lsg->layer[0].ev_selected = ev_lyr_no_select;
 		lsg->layer[0].ev_vis = vis_impl;
 		free(name);
+		gtk_widget_set_tooltip_text(wl, "This is an empty layer group with a\nvirtual auto layer implied.\nTo start editing, create a real layer\nin it using the right click menu.");
 	}
 	else {
 		for(n = 0; n < grp->len; n++) {