diff --git a/prometheus/doc.go b/prometheus/doc.go
index 1fdef9e..278969d 100644
--- a/prometheus/doc.go
+++ b/prometheus/doc.go
@@ -26,6 +26,7 @@
 //    package main
 //
 //    import (
+//    	"log"
 //    	"net/http"
 //
 //    	"github.com/prometheus/client_golang/prometheus"