diff --git a/README.md b/README.md
index eeff5526dcfaf4c256e691139966499efb72b0fa..931069e25dd58c4980af847d75625221e52fef98 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,9 @@ Options:
 
 -   (optional) `rpc_url` Node RPC url e.g. http://127.0.0.1:8545
 -   (optional) `chain_id` Chain id e.g. 636363
+-   (optional) `desired_vdf_duration` Desired VDF duration = mining duration e.g. 60secs
+
+Example: `cargo run mine http://127.0.0.1:8545' 636363 60`
 
 ## Env vars