Fix RAC spec typo
diff --git a/doc/spec/rac-spec.md b/doc/spec/rac-spec.md
index 01cad18..aecdec6 100644
--- a/doc/spec/rac-spec.md
+++ b/doc/spec/rac-spec.md
@@ -183,7 +183,7 @@
| CPtr[2] |L|S| CPtr[2], CLen[2], STag[2]
| ... |L|.| ..., ..., ...
| CPtr[A-2] |L|S| CPtr[Arity-2], CLen[Arity-2], STag[Arity-2]
- | CPtr[A-1] |L|S| CPtr[Arity-1], CLen[Arity-2], STag[Arity-1]
+ | CPtr[A-1] |L|S| CPtr[Arity-1], CLen[Arity-1], STag[Arity-1]
| CPtr[A] |V|A| CPtr[Arity] a.k.a. CPtrMax, Version, Arity
+-+-+-+-+-+-+-+-+