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-rw-r--r--doc/gpg.texi17
1 files changed, 14 insertions, 3 deletions
diff --git a/doc/gpg.texi b/doc/gpg.texi
index 9491dc83f..d6320f576 100644
--- a/doc/gpg.texi
+++ b/doc/gpg.texi
@@ -848,9 +848,10 @@ line.
@opindex keyedit:tsign
Make a trust signature. This is a signature that combines the notions
of certification (like a regular signature), and trust (like the
- "trust" command). It is generally only useful in distinct communities
- or groups. For more information please read the sections
- ``Trust Signature'' and ``Regular Expression'' in RFC-4880.
+ "trust" command). It is generally useful in distinct communities
+ or groups to implement the concept of a Trusted Introducer. For
+ more information please read the sections ``Trust Signature'' and
+ ``Regular Expression'' in RFC-4880.
@end table
@c man:.RS
@@ -1619,6 +1620,16 @@ for the BZIP2 compression algorithm (defaulting to 6 as well). This is a
different option from @option{--compress-level} since BZIP2 uses a
significant amount of memory for each additional compression level.
@option{-z} sets both. A value of 0 for @var{n} disables compression.
+A value of -1 forces compression using the default level.
+
+Except for the @option{--store} command compression is always used
+unless @command{gpg} detects that the input is already compressed. To
+inhibit the use of compression use @option{-z0}; to force compression
+use @option{-z-1} or option @option{z} with another compression level
+than the default as indicated by -1. Note that this overriding of the
+default deection works only with @option{z} and not with the long
+variant of this option.
+
@item --bzip2-decompress-lowmem
@opindex bzip2-decompress-lowmem