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-rw-r--r--src/include/taler_crypto_lib.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 73b92fe86..4c478cefd 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -1138,6 +1138,9 @@ struct TALER_BlindedDenominationSignature
*
* A value of 0 means that the exchange does not support the extension for
* age-restriction.
+ *
+ * For a non-0 age mask, the 0th bit always must be set, otherwise the age
+ * mask is considered invalid.
*/
struct TALER_AgeMask
{