diff --git a/collector/pkg/collector/base.go b/collector/pkg/collector/base.go
index ff1801f..3d4bdc9 100644
--- a/collector/pkg/collector/base.go
+++ b/collector/pkg/collector/base.go
@@ -40,6 +40,7 @@ func (c *BaseCollector) postJson(url string, body interface{}, target interface{
 	return json.NewDecoder(r.Body).Decode(target)
 }
 
+// http://www.linuxguide.it/command_line/linux-manpage/do.php?file=smartctl#sect7
 func (c *BaseCollector) LogSmartctlExitCode(exitCode int) {
 	if exitCode&0x01 != 0 {
 		c.logger.Errorln("smartctl could not parse commandline")
diff --git a/collector/pkg/config/config_test.go b/collector/pkg/config/config_test.go
index 1e8fd6d..8511c14 100644
--- a/collector/pkg/config/config_test.go
+++ b/collector/pkg/config/config_test.go
@@ -8,6 +8,19 @@ import (
 	"testing"
 )
 
+func TestConfiguration_InvalidConfigPath(t *testing.T) {
+	t.Parallel()
+
+	//setup
+	testConfig, _ := config.Create()
+
+	//test
+	err := testConfig.ReadConfig("does_not_exist.yaml")
+
+	//assert
+	require.Error(t, err, "should return an error")
+}
+
 func TestConfiguration_GetScanOverrides_Simple(t *testing.T) {
 	t.Parallel()