1 files changed, 6 insertions, 1 deletions
diff --git a/certmon.go b/certmon.go
index 155ff0f..36a520d 100644
--- a/certmon.go
+++ b/certmon.go
@@ -152,7 +152,12 @@ func (res CertResult) FormatPerfData() {
 }
 
 func (rl CertResultList) Format() {
-	//'label'=value[UOM];[warn];[crit];[min];[max]
+	// For details about Nagios plugin output format, refer to:
+	//   https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/pluginapi.html
+	// and
+	//   https://nagios-plugins.org/doc/guidelines.html
+	// In particular, performance data format is:
+	//   'label'=value[UOM];[warn];[crit];[min];[max]
 	fmt.Printf("%s - %s ", statusString[rl.Status], rl.Address)
 	rl.Result[0].FormatHR()
 	fmt.Printf(" | ")