README.md in embulk-output-ftp-0.1.1 vs README.md in embulk-output-ftp-0.1.2

@@ -113,9 +113,15 @@
 FTP_TEST_PASSWORD
 FTP_TEST_SSL_TRUSTED_CA_CERT_FILE
 FTP_TEST_SSL_TRUSTED_CA_CERT_DATA
 ```
 
+Following option is optional
+```
+FTP_TEST_PORT (default:21)
+FTP_TEST_SSL__PORT (default:990)
+```
+
 If you're using Mac OS X El Capitan and GUI Applications(IDE), like as follows.
 ```xml
 $ vi ~/Library/LaunchAgents/environment.plist
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
\ No newline at end of file