diff --git a/std/fiat-shamir/transcript.go b/std/fiat-shamir/transcript.go
index c9c64d228..f8c69aa1f 100644
--- a/std/fiat-shamir/transcript.go
+++ b/std/fiat-shamir/transcript.go
@@ -101,10 +101,10 @@ func (t *Transcript) Bind(challengeID string, values []frontend.Variable) error
 
 // ComputeChallenge computes the challenge corresponding to the given name.
 // The resulting variable is:
-// * H(name ∥ previous_challenge ∥ binded_values...) if the challenge is not the first one
-// * H(name ∥ binded_values... ) if it's is the first challenge
+//   - H(name ∥ previous_challenge ∥ binded_values...) if the challenge is not the first one
+//   - H(name ∥ binded_values... ) if it's is the first challenge
 func (t *Transcript) ComputeChallenge(challengeID string) (frontend.Variable, error) {
-
+	var err error
 	challenge, ok := t.challenges[challengeID]
 
 	if !ok {