Update README.

Author: skuroda

README.md

@@ -158,7 +158,7 @@ Setting to control if VCS management is used when moving and removing files.
 
 `file_templates`:
 
-An object containing information to use for templates when creating new files. The key values for this object should be a file extension. The value may either be a string of the content to be inserted or a list of paths. If a list of paths is specified, the name of the file will be displayed during selection. The paths must either be absolute, or be from the home directory of the user (`~/`). If a string is used, or the list contains a single entry, it will be automatically inserted into any newly created files.
+An object containing information to use for templates when creating new files. The key values for this object should be a file extension. The value may either be a string of the content to be inserted or a list of paths. If a list of paths is specified, the name of the file will be displayed during selection. The paths must either be absolute, or be from the home directory of the user (`~/`). The file format should match that of a ST snippet. If a string is used, or the list contains a single entry, it will be automatically inserted into any newly created files.
 
 `posix_input`: