diff --git a/internal/jwt/service.go b/internal/jwt/service.go
index 9c74f9e..b938248 100644
--- a/internal/jwt/service.go
+++ b/internal/jwt/service.go
@@ -35,6 +35,7 @@ func (s *Service) Generate(ttl time.Duration, extraClaims jwt.MapClaims) (string
 }
 
 // Validate verifies the JWT token and extracts the claims and JTI(JWT IDentifier).
+// Returns claims, jti, and error if any.
 func (s *Service) Validate(token string) (jwt.MapClaims, string, error) {
 	claims, err := s.signer.Verify(token)
 	if err != nil {