fix #2204

cmd/cert_stub.go

@@ -14,11 +14,10 @@ import (
 )
 
 var CmdCert = cli.Command{
-	Name:  "cert",
-	Usage: "Generate self-signed certificate",
-	Description: `Generate a self-signed X.509 certificate for a TLS server. 
-Outputs to 'cert.pem' and 'key.pem' and will overwrite existing files.`,
-	Action: runCert,
+	Name:        "cert",
+	Usage:       "Generate self-signed certificate",
+	Description: `Please use build tags "cert" to rebuild Gogs in order to have this ability`,
+	Action:      runCert,
 }
 
 func runCert(ctx *cli.Context) {