Simple annotation system for files.
If control characters appear inside Elisp strings, using octal escapes inside the string might make more sense. – AlexSchroeder
Thanks, I fixed it. – TamasPatrovics
Are there plans to support annotations for specific line numbers? Or hyperlinking from the annotation file? If not I suppose I will be working on that sometime. – pmv
I haven’t touched it for 3 years, so there are no plans for improving it. 
You can take it over if you want. – TamasPatrovics