diff --git a/02.md b/02.md
index eb65f63..9e438fa 100644
--- a/02.md
+++ b/02.md
@@ -37,5 +37,5 @@ Inconvenient for onboarding new users who have no UTXO possession in the beginni
  - - The BDS-02 child public key pk<sub>i</sub>.
  - - pk<sub>i</sub> BIP-340 tweak t<sub>i</sub> : 32-byte array.
  - - Let t<sub>i</sub> = hash<sub>BDS-02 tweak</sub>(ds || bytes(32, i)).
- - - Let pk<sub>i</sub> = _cbytes(int(npub) + int(t<sub>i</sub>)⋅G)_.
- - - Let sk<sub>i</sub> = bytes(32, (_int(nsec) + int(t<sub>i</sub> )) % n)_.
+ - - Let pk<sub>i</sub> = _cbytes(npub + int(t<sub>i</sub>)⋅G)_.
+ - - Let sk<sub>i</sub> = _bytes(32, (int(nsec) + int(t<sub>i</sub> )) % n)_.