Update README.md

jenkins-zh · Nov 16, 2022 · 60b8c72 · 60b8c72
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@@ -16,7 +16,7 @@ GitHub Action for backup your git repository.
 
 ## Environment Variables
 
-- `GIT_DEPLOY_KEY` - *Required* your deploy key which has **Write access**
+- `GIT_DEPLOY_KEY` - *Required* your deploy key (ssh private key) which has **Write access**
 - `TARGET_GIT` : **required**, your backup git repository (please use ssh or git protocol)
 
 ```