diff --git a/src/net/mail/message.go b/src/net/mail/message.go
index 42701f390cc..5679e348f89 100644
--- a/src/net/mail/message.go
+++ b/src/net/mail/message.go
@@ -751,13 +751,13 @@ func (p *addrParser) consumeDomainLiteral() (string, error) {
 		return "", errors.New("mail: unclosed domain-literal")
 	}
 
+	// Check if the domain literal is an IP address
 	if addr, ok := strings.CutPrefix(dtext, "IPv6:"); ok {
 		if len(net.ParseIP(addr)) != net.IPv6len {
 			return "", fmt.Errorf("mail: invalid IPv6 address in domain-literal: %q", dtext)
 		}
 
 	} else if net.ParseIP(dtext).To4() != nil {
-		// Check if the domain literal is an IP address
 		return "", fmt.Errorf("mail: invalid IP address in domain-literal: %q", dtext)
 	}