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-rw-r--r--doc/DETAILS6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/DETAILS b/doc/DETAILS
index a74c0e907..e7a5d423b 100644
--- a/doc/DETAILS
+++ b/doc/DETAILS
@@ -57,7 +57,11 @@ record; gpg2 does this by default and the option is a dummy.
f = The key is fully trusted
u = The key is ultimately trusted. This often means
that the secret key is available, but any key may
- be marked as ultimately trusted.
+ be marked as ultimately trusted.
+
+ For X.509 certificates an 'u' is used for a trusted root
+ certificates (i.e. for the truct anchor) and and 'f' for
+ all other validated certificates.
3. Field: length of key in bits.