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diff --git a/doc/keyformat.txt b/doc/keyformat.txt
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+++ b/doc/keyformat.txt
@@ -89,6 +89,10 @@ The UTC time the key was created in ISO compressed format
(yyyymmddThhmmss). This information can be used to re-create an
OpenPGP key.
+*** Link
+For a composite key this item gives the keygrip of the other key part.
+In particular Kyber keys may use this to link to the ECC part and vice versa.
+
*** Label
This is a short human readable description for the key which can be
used by the software to describe the key in a user interface. For