diff --git a/pkg/mailer/sendmail.go b/pkg/mailer/sendmail.go
index 74bf8c3..7c7afbb 100644
--- a/pkg/mailer/sendmail.go
+++ b/pkg/mailer/sendmail.go
@@ -73,5 +73,5 @@ func findSendmailPath() (path string, err error) {
 		}
 	}
 
-	return "", errors.New("Failed to locate a sendmail executable path.")
+	return "", errors.New("failed to locate a sendmail executable path")
 }
diff --git a/pkg/query/formatting.go b/pkg/query/formatting.go
index 131a980..6de0c11 100644
--- a/pkg/query/formatting.go
+++ b/pkg/query/formatting.go
@@ -12,9 +12,9 @@ const (
 )
 
 var (
-	errInvalidInput error = errors.New("Invalid input")
-	errNoneTagFound error = errors.New("No tag found")
-	errFieldNull    error = errors.New("Field null")
+	errInvalidInput error = errors.New("invalid input")
+	errNoneTagFound error = errors.New("no tag found")
+	errFieldNull    error = errors.New("field null")
 )
 
 // FormatValuesInUp format columns and values ​​for an insert or update query