diff --git a/README.md b/README.md
index 2cd550a..505ce72 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ export PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f
 export ETH_FROM=0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
 export RLN_RELAY_EPOCH_SEC=10
 export RLN_RELAY_MSG_LIMIT=2
+export MAX_MESSAGE_LIMIT=100  # Contract's message limit. Needs to be higher or equal than RLN_RELAY_MSG_LIMIT, otherwise nodes won't start correctly.
 
 docker-compose --compatibility up -d
 ```