diff -urN gimp-2.6.11-orig/app/core/gimplayermask.c gimp-2.6.11/app/core/gimplayermask.c
--- gimp-2.6.11-orig/app/core/gimplayermask.c	2010-07-03 07:51:55 +0900
+++ gimp-2.6.11/app/core/gimplayermask.c	2010-12-26 22:49:47 +0900
@@ -232,7 +232,8 @@
       GimpImage *image = GIMP_ITEM (layer_mask)->image;
 
       if (push_undo)
-        gimp_image_undo_push_layer_mask_apply (image, _("Apply Layer Mask"),
+        gimp_image_undo_push_layer_mask_apply (image,
+                                               apply ? _("Enable Layer Mask") : _("Disable Layer Mask"),
                                                layer_mask);
 
       layer_mask->apply_mask = apply ? TRUE : FALSE;