diff --git a/pkg/cibot/pullrequest.go b/pkg/cibot/pullrequest.go
index 3c162bffb97aa3142a3960e8ee22bfaba6c0908f..7202c97171b3cc39dce7fba233c4201623d8832c 100644
--- a/pkg/cibot/pullrequest.go
+++ b/pkg/cibot/pullrequest.go
@@ -14,7 +14,7 @@ import (
 const (
 	cannotMergeMessage = `This pull request can not be merged, you can try it again when label requirement meets. :astonished:
 %s`
-	nonRequiringLabelsMessage = ` Labels [**%s**] need to be added.`
+	nonRequiringLabelsMessage = ` Labels [**%s**] need to be added by command "/check-cla."`
 	nonMissingLabelsMessage   = ` Labels [**%s**] need to be removed.`
 )