How to specify OLD-NAME when using RenameDefinition in the command line refactorer ht-refact

[SnowOnion]

The document said the command format is:

RenameDefinition MODULE SRC-RANGE NEW-NAME

But in order to change f x = x + 1 to g x = x + 1, how to specify the old name f?

My usage was like,

➜  try1 ht-refact --no-watch .
Found modules: /Users/sonion/dev/Haskell/use-haskell-tools/try1/Hello.hs
Loaded module: Hello( /Users/sonion/dev/Haskell/use-haskell-tools/try1/Hello.hs) 
RenameDefinition Hello 12:1-14:1 g
No name is selected

Thanks!