diff --git a/deployhooks.md b/deployhooks.md
index b493e25..f527838 100644
--- a/deployhooks.md
+++ b/deployhooks.md
@@ -400,7 +400,12 @@ export VAULT_KV_V2="1"
 ```
 
 You can also use `--deploy-hook vault` instead of `vault_cli`. In that case Vault's HTTP
-API will be used allowing you to use Docker image for deployment without Vault binary.
+API will be used allowing you to use Docker image for deployment without Vault binary. 
+
+Another ENV variable is needed for `vault`
+```sh
+export VAULT_ADDR=http://localhost:8200 # no slash at the end
+```
 
 ## 13. Deploy your certificate to Qiniu.com