diff --git a/README.md b/README.md
index f54e8e6..5781394 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ If you already have Go, Qemu and Docker installed, there's cross-platform instal
     $ rm -rf {Debian,CentOS,Ubuntu/{14.04,18.04}} # speed up :)
     $ ./bootstrap.sh
     $ # wait several hours...
-    $ export OUT_OF_TREE_KERNELS_CONFIG=$GOPATH/src/github.com/jollheef/out-of-tree/tools/kernel-factory/output/kernels.toml
+    $ export OUT_OF_TREE_KCFG=$GOPATH/src/github.com/jollheef/out-of-tree/tools/kernel-factory/output/kernels.toml
     $ cd ../../examples/kernel-exploit
     $ # test kernel exploit
     $ out-of-tree pew
diff --git a/main.go b/main.go
index 2711f87..d74b936 100644
--- a/main.go
+++ b/main.go
@@ -429,17 +429,18 @@ func pewHandler(workPath, kcfgPath string) (err error) {
 }
 
 func main() {
-	pewCommand := kingpin.Command("pew", "Build, run and test module/exploit")
-	path := pewCommand.Arg(
-		"path", "Path to work directory").Default(".").ExistingDir()
-	kernelsConfig := pewCommand.Flag(
-		"kernels-config", "Path to kernels config").Envar(
-		"OUT_OF_TREE_KERNELS_CONFIG").Required().ExistingFile()
+	pathFlag := kingpin.Flag("path", "Path to work directory")
+	path := pathFlag.Default(".").ExistingDir()
+
+	kcfgFlag := kingpin.Flag("kernels", "Path to kernels config")
+	kcfg := kcfgFlag.Envar("OUT_OF_TREE_KCFG").Required().ExistingFile()
+
+	kingpin.Command("pew", "Build, run and test module/exploit")
 
 	var err error
 	switch kingpin.Parse() {
 	case "pew":
-		err = pewHandler(*path, *kernelsConfig)
+		err = pewHandler(*path, *kcfg)
 	}
 
 	if err != nil {