diff --git a/README.md b/README.md
index e9ba094..a49957b 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,7 @@ Flags:
       --resp-timeout=DURATION  Timeout for full response reading
       --socks5=ip:port         Socks5 proxy
       --auto-open-browser      Specify whether auto open browser to show Web charts
+      --not-clear              Don't clear the histogram bar once its finished
       --version                Show application version.
 
   Flags default values also read from env PLOW_SOME_FLAG, such as PLOW_TIMEOUT=5s equals to --timeout=5s