Textastic for Mac needs a User Manual (or if it exists it needs to be off the Help menu)
There seems to be a great user-guide for iOS but nothing for Mac.
Even something really basic indicating the key features and where to look for additional info would be great.
For example, the ability to customise the editor needs a quick overview to say (a) What you support (b) Where to find out how to customise it.
Customer support service by UserEcho