Schnorr signature documentation typo

In the provided documentation, the steps to implement Nocturne's variant of Schnorr signatures over the Baby Jubjub curve are described as follows:

1. $h\leftarrow \text{SHA512}(sk)$

2. $s\leftarrow h[0:32]$ (derive the signing secret key from the spending key)

3. $x\leftarrow h[32:64]$ (extract 32 bytes of entropy from the spending key)

4. $v\leftarrow \text{randomBytes}(32)$ (sample another 32 random bytes)

5. $n\leftarrow \text{SHA512}(x||v||m)\mathrm{mod}r\in {\mathbb{F}}_r$ ("reduce" hash output into ${\mathbb{F}}_r$, using extra entropy from $sk$ addition to the rng)

6. $R\leftarrow n\times G$ (the rest is a "standard" Schnorr signature)

7. $c\leftarrow H(\text{PK.X}||R.X||R.Y||m)$

8. $z\leftarrow n-\text{sk}\cdot c$

9. The signature is the pair $(c,z)$

In step 8, $z$ in the signature is generated using $sk$; however, it should be $z\leftarrow n-s\cdot c$ generated using $s$ because the spending key $sk$ is only used to derive the signing secret key.