Initial

1 files changed, 8 insertions, 0 deletions

diff --git a/errors.go b/errors.go
new file mode 100644
index 0000000..fd57ccc
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,8 @@
+package checksum
+
+import "errors"
+
+var (
+	ErrInvalidNumber   = errors.New("invalid number")   // number contains non numeric symbols
+	ErrInvalidChecksum = errors.New("invalid checksum") // number not correct by luhn algorithm
+)