diff --git a/gopmod/classfile.go b/gopmod/classfile.go
index af0e821..502d461 100644
--- a/gopmod/classfile.go
+++ b/gopmod/classfile.go
@@ -45,11 +45,9 @@ var (
 
 // -----------------------------------------------------------------------------
 
-type Kind = modfile.Kind
-
-func (p *Module) ClassKind(ext string) (kind Kind) {
+func (p *Module) ClassKind(ext string) (isWork, isProj bool) {
 	if c, ok := p.projects[ext]; ok {
-		kind = c.Kind(ext)
+		isWork, isProj = c.Kind(ext)
 	}
 	return
 }
diff --git a/modfile/rule.go b/modfile/rule.go
index 17fdebe..2f34997 100644
--- a/modfile/rule.go
+++ b/modfile/rule.go
@@ -80,23 +80,14 @@ type Class struct {
 	Syntax *Line
 }
 
-type Kind int
-
-const (
-	KindNone    Kind = 0
-	KindWork         = 1
-	KindProject      = 2
-	KindBoth         = KindProject | KindWork
-)
-
-func (p *Project) Kind(ext string) (kind Kind) {
+func (p *Project) Kind(ext string) (isWork, isProj bool) {
 	for _, w := range p.Works {
 		if w.Ext == ext {
-			kind |= KindWork
+			isWork = true
 		}
 	}
 	if p.Ext == ext {
-		kind |= KindProject
+		isProj = true
 	}
 	return
 }
diff --git a/modfile/rule_test.go b/modfile/rule_test.go
index 4a48037..20c3bad 100644
--- a/modfile/rule_test.go
+++ b/modfile/rule_test.go
@@ -93,9 +93,9 @@ func TestMustQuote(t *testing.T) {
 
 func TestKind(t *testing.T) {
 	proj := &Project{Works: []*Class{{Ext: ".spx"}}, Ext: ".spx"}
-	kind := proj.Kind(".spx")
-	if kind != KindBoth {
-		t.Fatal("proj.Kind:", kind)
+	isWork, isProj := proj.Kind(".spx")
+	if !isWork || !isProj {
+		t.Fatal("proj.Kind:", isWork, isProj)
 	}
 }