diff --git a/graph/tags/tags.go b/graph/tags/tags.go
index b174b720c6..c122675ab4 100644
--- a/graph/tags/tags.go
+++ b/graph/tags/tags.go
@@ -6,12 +6,10 @@ import (
 	"github.com/docker/distribution/registry/api/v2"
 )
 
-// DefaultTag is the default tag for the case where no explicit tag is
-// specified.
+// DefaultTag defines the default tag used when performing images related actions and no tag string is specified
 const DefaultTag = "latest"
 
-// ErrTagInvalidFormat is an error type used when the tag name has invalid
-// characters or is longer than allowed.
+// ErrTagInvalidFormat is returned if tag is invalid.
 type ErrTagInvalidFormat struct {
 	name string
 }
@@ -20,7 +18,9 @@ func (e ErrTagInvalidFormat) Error() string {
 	return fmt.Sprintf("Illegal tag name (%s): only [A-Za-z0-9_.-] are allowed ('.' and '-' are NOT allowed in the initial), minimum 1, maximum 128 in length", e.name)
 }
 
-// ValidateTagName validates the name of a tag
+// ValidateTagName validates the name of a tag.
+// It returns an error if the given name is an emtpy string.
+// If name does not match v2.TagNameAnchoredRegexp regexp, it returns ErrTagInvalidFormat
 func ValidateTagName(name string) error {
 	if name == "" {
 		return fmt.Errorf("tag name can't be empty")
diff --git a/hack/make/validate-lint b/hack/make/validate-lint
index ef384bdfb2..2e8894b9e8 100644
--- a/hack/make/validate-lint
+++ b/hack/make/validate-lint
@@ -26,6 +26,7 @@ packages=(
 	daemon/execdriver/windows
 	daemon/graphdriver/aufs
 	daemon/graphdriver/devmapper
+	daemon/graphdriver/vfs
 	daemon/graphdriver/zfs
 	daemon/logger
 	daemon/logger/fluentd
@@ -37,7 +38,7 @@ packages=(
 	docker
 	dockerinit
 	graph
-	daemon/graphdriver/vfs
+	graph/tags
 	image
 	integration-cli
 	pkg/broadcastwriter