[taler-docs] 11/15: -mention the private keys of the derived age commitments

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commit 5eda8c850815ca48d08e07d2e2286cdfe89638d9
Author: Özgür Kesim <oec-taler@kesim.org>
AuthorDate: Tue Jan 10 19:03:00 2023 +0100

    -mention the private keys of the derived age commitments
---
 design-documents/024-age-restriction.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/design-documents/024-age-restriction.rst 
b/design-documents/024-age-restriction.rst
index 3d743e4..74870c3 100644
--- a/design-documents/024-age-restriction.rst
+++ b/design-documents/024-age-restriction.rst
@@ -409,7 +409,9 @@ For the age commitment, calculate:
            q_a &:= \text{Edx25519\_derive\_public}(P, f_a).
 
 Then the vector :math:`\vec{q} = \{q_1,\ldots,q_M\}` is then the age commitment
-associated to private key :math:`c_s`.
+associated to the coin's private key :math:`c_s`.  For the non-disclosed coins,
+the wallet can use the vector :math:`(p_1,\ldots,p_m,\bot,\ldots,\bot)` of
+private keys for the attestation.
 
 Provided with the private key :math:`c_s`, the exchange can therefore calculate
 the blinding :math:`\beta` and the age commitment :math:`\vec{q}` itself, along

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