pivot-table: Implement hiding footnotes.

[pspp] / doc / dev / spv-file-format.texi

diff --git a/doc/dev/spv-file-format.texi b/doc/dev/spv-file-format.texi
index 723550a3723ed8487e14b0d9c8f783b4480deed7..54decbcf52bfa7034c6b34bc4465115c7aa3451b 100644 (file)
--- a/doc/dev/spv-file-format.texi
+++ b/doc/dev/spv-file-format.texi
@@ -1101,6 +1101,7 @@ reference other footnotes, but in practice this doesn't work.
 @code{show} is a 32-bit signed integer.  It is positive to show the
 footnote or negative to hide it.  Its magnitude is often 1, and in
 other cases tends to be the number of references to the footnote.
+It is safe to write 1 to show a footnote and -1 to hide it.
 
 @node SPV Light Member Areas
 @subsection Areas