spec/index | 1 +

diff --git a/spec/index b/spec/index
index 2f094d4d27b0de05ef236d1ade5cd0e62a8d98bc76f295ccab56b4b8a341da14..295e726cf2cf6471ad82444fda136f111f58f385071c6c5e3fdf6198db84d29e 100644
--- a/spec/index
+++ b/spec/index
@@ -4,6 +4,7 @@ memory, storage and codec implementation size usage. It supports wide
 range of data types, making it able to transparently replace JSON.
 
 KEKS means: kompakt, entschlossen, knapp, strömen.
+Previously known as: YAC (YAC ain't a CBOR).
 
 But why!? Because there is no satisfiable codec for all set of
 requirements below.