diff --git a/lib/kubecfg_test.jsonnet b/lib/kubecfg_test.jsonnet
index 1e288153821f3e6a7e5ca57d989f3d4f63b0061b..5a49f71834b7e0f901d104e629d3d0301341a3e2 100644
--- a/lib/kubecfg_test.jsonnet
+++ b/lib/kubecfg_test.jsonnet
@@ -13,7 +13,7 @@
 //    See the License for the specific language governing permissions and
 //    limitations under the License.
 
-// Run me with `../kubecfg show kubecfg_test.jsonnet`
+// Run me with `../kubecfg show -f kubecfg_test.jsonnet`
 local kubecfg = import "kubecfg.libsonnet";
 
 assert kubecfg.parseJson("[3, 4]") == [3, 4];