diff --git a/build_action.sh b/build_action.sh
index c03e433..42f8f89 100644
--- a/build_action.sh
+++ b/build_action.sh
@@ -15,6 +15,7 @@ cd "${GITHUB_WORKSPACE}" || exit
 
 # download kernel source
 wget http://www.kernel.org/pub/linux/kernel/v5.x/linux-"$VERSION".tar.xz
+ls
 tar -xf linux-"$VERSION".tar.xz
 cd linux-"$VERSION" || exit