diff --git a/cmd/serve.go b/cmd/serve.go
index fb07ffb..2d131df 100644
--- a/cmd/serve.go
+++ b/cmd/serve.go
@@ -64,5 +64,5 @@ func init() {
 
 	serveCmd.Flags().StringVarP(&binary, "binary", "b", "/usr/bin/google-chrome", "chrome, chromium or headless binary path")
 	serveCmd.Flags().DurationVarP(&duration, "duration", "d", 60*time.Minute, "how long the values live in the cache")
-	serveCmd.Flags().IntVarP(&maxmem, "maxmem", "m", 500*1024*1024, "maximum memory the cache may use in bytes")
+	serveCmd.Flags().IntVarP(&maxmem, "maxmem", "m", 512, "maximum memory in MB the cache may use")
 }