diff --git a/lib/Slic3r/Extruder.pm b/lib/Slic3r/Extruder.pm
index a7428bc5e..b04546971 100644
--- a/lib/Slic3r/Extruder.pm
+++ b/lib/Slic3r/Extruder.pm
@@ -45,7 +45,7 @@ sub change_layer {
     my $gcode = "";
     
     $gcode .= $self->retract(move_z => $z);
-    $gcode .= $self->G0(undef, $z, 0, 'move to next layer')
+    $gcode .= $self->G0(undef, $z, 0, 'move to next layer (' . $layer->id . ')')
         if $self->z != $z;
     
     $gcode .= Slic3r::Config->replace_options($Slic3r::layer_gcode) . "\n"