diff --git a/DOCS.md b/DOCS.md
index c52138b..c41cd0f 100644
--- a/DOCS.md
+++ b/DOCS.md
@@ -181,33 +181,33 @@ Example configuration for passphrase which protecting a private key:
 
 | Key | Description |
 |-----|-------------|
-| ssh_username | account for target host user |
-| ssh_password | password for target host user | |
-| ssh_passphrase | The purpose of the passphrase is usually to encrypt the private key. |
-| ssh_key | plain text of user private key |
-| proxy_ssh_username | account for user of proxy server |
-| proxy_ssh_password | password for user of proxy server |
-| proxy_ssh_passphrase | The purpose of the passphrase is usually to encrypt the private key. |
-| proxy_ssh_key | plain text of user private key for proxy server |
+| `ssh_username` | account for target host user |
+| `ssh_password` | password for target host user | |
+| `ssh_passphrase` | The purpose of the passphrase is usually to encrypt the private key. |
+| `ssh_key` | plain text of user private key |
+| `proxy_ssh_username` | account for user of proxy server |
+| `proxy_ssh_password` | password for user of proxy server |
+| `proxy_ssh_passphrase` | The purpose of the passphrase is usually to encrypt the private key. |
+| `proxy_ssh_key` | plain text of user private key for proxy server |
 
 ## Parameter Reference
 
 | Key | Description |
 |-----|-------------|
-| host | target hostname or IP |
-| port | ssh port of target host |
-| username | account for target host user |
-| password | password for target host user |
-| key | plain text of user private key |
-| key_path | key path of user private key |
-| envs | custom secrets which are made available in the script section |
-| script | execute commands on a remote server |
-| script_stop | stop script after first failure |
-| timeout | Timeout is the maximum amount of time for the ssh connection to establish, default is 30 seconds. |
-| command_timeout | Command timeout is the maximum amount of time for the execute commands, default is 10 minutes. |
-| proxy_host | proxy hostname or IP |
-| proxy_port | ssh port of proxy host |
-| proxy_username | account for proxy host user |
-| proxy_password | password for proxy host user |
-| proxy_key | plain text of proxy private key |
-| proxy_key_path | key path of proxy private key |
+| `host` | target hostname or IP |
+| `port` | ssh port of target host |
+| `username` | account for target host user |
+| `password` | password for target host user |
+| `key` | plain text of user private key |
+| `key_path` | key path of user private key |
+| `envs` | custom secrets which are made available in the script section |
+| `script` | execute commands on a remote server |
+| `script_stop` | stop script after first failure |
+| `timeout` | Timeout is the maximum amount of time for the ssh connection to establish, default is 30 seconds. |
+| `command_timeout` | Command timeout is the maximum amount of time for the execute commands, default is 10 minutes. |
+| `proxy_host` | proxy hostname or IP |
+| `proxy_port` | ssh port of proxy host |
+| `proxy_username` | account for proxy host user |
+| `proxy_password` | password for proxy host user |
+| `proxy_key` | plain text of proxy private key |
+| `proxy_key_path` | key path of proxy private key |