Clarify regtest explanation.

diff --git a/input/regression/whiteout.ly b/input/regression/whiteout.ly
index 5e3b8b0ef27711c7a69cef873fe8c00f045908c9..52f518ee86f120f6c9e933a45b58fed4e2b84da7 100644 (file)
--- a/input/regression/whiteout.ly
+++ b/input/regression/whiteout.ly
@@ -2,7 +2,7 @@
 
   texidoc = "The whiteout command underlays a white box under a
 markup.  The whitening effect only is only guaranteed for staff lines,
-since staff lines are in a different layer.  "
+since staff lines are in a lower layer than most other grobs.  "
 
 }
 \version "2.10.0"