diff --git a/shell.go b/shell.go
index 6b4d1a2..faaad07 100644
--- a/shell.go
+++ b/shell.go
@@ -188,6 +188,10 @@ func Mkdir(dir string) bool {
 	return true
 }
 
+func IsDir(dirname string) bool {
+	return Dir(dirname)
+}
+
 // return true if the filename exists (cross-platform)
 func Dir(dirname string) bool {
 	info, err := os.Stat(Path(dirname))