Fix missing printf arguments discovered by "go vet"

1 files changed, 1 insertions, 1 deletions

diff --git a/checkdir.go b/checkdir.go
index b597834..9614d7d 100644
--- a/checkdir.go
+++ b/checkdir.go
@@ -27,7 +27,7 @@ func checkDir(dir string) error {
 		return err
 	}
 	if !fi.IsDir() {
-		return fmt.Errorf("%s is not a directory")
+		return fmt.Errorf("%s is not a directory", dir)
 	}
 	return nil
 }