diff --git a/README.md b/README.md
index cdfd7f2..86009b8 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Usage:
   ifacemaker [OPTIONS]
 
 Application Options:
-  -f, --file=          Go source file to read
+  -f, --file=          Go source file to read, either filename or glob
   -s, --struct=        Generate an interface for this structure name
   -i, --iface=         Name of the generated interface
   -p, --pkg=           Package name for the generated interface
diff --git a/ifacemaker.go b/ifacemaker.go
index b7e9c55..9ee8d03 100644
--- a/ifacemaker.go
+++ b/ifacemaker.go
@@ -5,13 +5,14 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"path/filepath"
 
-	flags "github.com/jessevdk/go-flags"
+	"github.com/jessevdk/go-flags"
 	"github.com/vburenin/ifacemaker/maker"
 )
 
 type cmdlineArgs struct {
-	Files        []string `short:"f" long:"file" description:"Go source file to read" required:"true"`
+	Files        []string `short:"f" long:"file" description:"Go source file to read, either filename or glob" required:"true"`
 	StructType   string   `short:"s" long:"struct" description:"Generate an interface for this structure name" required:"true"`
 	IfaceName    string   `short:"i" long:"iface" description:"Name of the generated interface" required:"true"`
 	PkgName      string   `short:"p" long:"pkg" description:"Package name for the generated interface" required:"true"`
@@ -44,8 +45,15 @@ func main() {
 	if args.IfaceComment == "" {
 		args.IfaceComment = fmt.Sprintf("%s ...", args.IfaceName)
 	}
-
-	result, err := maker.Make(args.Files, args.StructType, args.Comment, args.PkgName, args.IfaceName, args.IfaceComment, args.copyDocs, args.CopyTypeDoc)
+	var files []string
+	for _, filePattern := range args.Files {
+		matches, err := filepath.Glob(filePattern)
+		if err != nil {
+			log.Fatal(err)
+		}
+		files = append(files, matches...)
+	}
+	result, err := maker.Make(files, args.StructType, args.Comment, args.PkgName, args.IfaceName, args.IfaceComment, args.copyDocs, args.CopyTypeDoc)
 	if err != nil {
 		log.Fatal(err.Error())
 	}
diff --git a/ifacemaker_test.go b/ifacemaker_test.go
index 4a26496..e65d82d 100644
--- a/ifacemaker_test.go
+++ b/ifacemaker_test.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 	"testing"
 
 	assert "github.com/stretchr/testify/assert"
@@ -89,6 +90,15 @@ func (s *TestImpl) fooHelper() string {
 	return ""
 }`
 
+var src2_extend = `package maker
+import (
+	"github.com/vburenin/ifacemaker/maker/footest"
+)
+
+func (s *TestImpl) UpdateUser(userID string) *footest.User {
+    return &footest.User{}, nil
+}
+`
 var src3 = `package footest
 
 type User struct {
@@ -98,6 +108,7 @@ type User struct {
 
 var srcFile = os.TempDir() + "/ifacemaker_src.go"
 var srcFile2 = os.TempDir() + "/test_impl.go"
+var srcFile2_ext = os.TempDir() + "/test_impl_extended.go"
 var srcFile3 = os.TempDir() + "/footest/footest.go"
 
 func TestMain(m *testing.M) {
@@ -110,6 +121,7 @@ func TestMain(m *testing.M) {
 	}
 	writeTestSourceFile(src, srcFile)
 	writeTestSourceFile(src2, srcFile2)
+	writeTestSourceFile(src2_extend, srcFile2_ext)
 	writeTestSourceFile(src3, srcFile3)
 
 	os.Exit(m.Run())
@@ -276,6 +288,32 @@ type TestInterface interface {
 	assert.Equal(t, expected, out)
 }
 
+func TestMainFileGlob(t *testing.T) {
+	src := strings.Replace(srcFile2, "test_impl.go", "test*.go", 1)
+	//assert.True(t, strings.HasSuffix(srcFile2, "test*.go"))
+	//assert.Equal(t, "bla", src)
+	//ssert.Contains(t, src, "test*")
+	os.Args = []string{"cmd", "-f", src, "-s", "TestImpl", "-p", "footest", "-c", "DO NOT EDIT: Auto generated", "-i", "TestInterface", "-d=false"}
+	out := captureStdout(func() {
+		main()
+	})
+
+	expected := `// DO NOT EDIT: Auto generated
+
+package footest
+
+// TestInterface ...
+type TestInterface interface {
+	GetUser(userID string) *User
+	CreateUser(user *User) (*User, error)
+	UpdateUser(userID string) *User
+}
+
+`
+
+	assert.Equal(t, expected, out)
+}
+
 // not thread safe
 func captureStdout(f func()) string {
 	old := os.Stdout