I have listened an online radio show today. In the show, they mentioned "Programmer does not only write code. We do design as well!" I totally agree with them.
Even I write the application for myself, I will write a Requirement Specification. It will included a paragraph about the background of application(What is the application does, Why do I write this application), system specification(Hardware&Software) and User cases.
Programmer=> Application + Design + Documentations + Testing!