diff --git a/lib/http/server.go b/lib/http/server.go
index 518f07f7f..2b5270d98 100644
--- a/lib/http/server.go
+++ b/lib/http/server.go
@@ -174,7 +174,7 @@ type Config struct {
 
 // AddFlagsPrefix adds flags for the httplib
 func (cfg *Config) AddFlagsPrefix(flagSet *pflag.FlagSet, prefix string) {
-	flags.StringArrayVarP(flagSet, &cfg.ListenAddr, prefix+"addr", "", cfg.ListenAddr, "IPaddress:Port or :Port to bind server to", prefix)
+	flags.StringArrayVarP(flagSet, &cfg.ListenAddr, prefix+"addr", "", cfg.ListenAddr, "IPaddress:Port, :Port or [unix://]/path/to/socket to bind server to", prefix)
 	flags.DurationVarP(flagSet, &cfg.ServerReadTimeout, prefix+"server-read-timeout", "", cfg.ServerReadTimeout, "Timeout for server reading data", prefix)
 	flags.DurationVarP(flagSet, &cfg.ServerWriteTimeout, prefix+"server-write-timeout", "", cfg.ServerWriteTimeout, "Timeout for server writing data", prefix)
 	flags.IntVarP(flagSet, &cfg.MaxHeaderBytes, prefix+"max-header-bytes", "", cfg.MaxHeaderBytes, "Maximum size of request header", prefix)