Docs: LM 4.3.1: Add warning about setting stencil to #f

diff --git a/Documentation/user/tweaks.itely b/Documentation/user/tweaks.itely
index 077d538437bc74004d67f1d74f8b8d27a8a58e3e..56b581d8e1c108b3b2fe88b2eb92441823144068 100644 (file)
--- a/Documentation/user/tweaks.itely
+++ b/Documentation/user/tweaks.itely
@@ -1053,6 +1053,12 @@ it by adding the correct context:
 
 Now the bar lines have vanished.
 
+Note, though, that setting the @code{stencil} property to @code{#f}
+will cause errors when the dimensions of the object are required for
+correct processing.  For example, errors will be generated if the
+@code{stencil} property of the @code{NoteHead} object is set to
+@code{#f}.
+
 @subheading break-visibility
 
 @cindex break-visibility property