run.go | 1 +

diff --git a/run.go b/run.go
index d7f227cd168e012a7448ff1625f092792fe49640e463c643eda867195afd605a..9b0303243c9b9430cb69fd00dfced82259325e21135d85229e1bd05fb186575e 100644
--- a/run.go
+++ b/run.go
@@ -327,6 +327,7 @@
 	cmd := exec.Command(cmdName, args...)
 	cmd.Dir = cwd
 	cmd.Stdout = fdStdout
+	// cmd.Stdin reads from /dev/null by default
 	cmd.Env = append(os.Environ(), fmt.Sprintf("%s=%d", EnvLevel, Level+1))
 	cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDirPrefix, dirPrefix))
 	cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvBuildUUID, BuildUUID))