diff --git a/pkg/error/validation.go b/pkg/error/validation.go
index 143635e..fdaf0d9 100644
--- a/pkg/error/validation.go
+++ b/pkg/error/validation.go
@@ -11,6 +11,7 @@ const (
 	UserSourceIDIsEmpty = "userSourceID cannot be empty"
 	UserSourceIDToShort = "userSourceID needs to be 25 characters long"
 
+	TagNameIsEmpty = "tagName cannot be empty"
 	TagListIsEmpty = "tagList cannot be empty"
 
 	TagAliasListIsEmpty = "tagAliasList cannot be empty"