My only intention is to edit for accuracy when I see things that I think are incorrect. I occasionally add information where I have factual matters to add. For instance;
Correcting the Author JM Coetzee's name from John Martin to John Maxwell
Correcting OPC to Ordinary Portland Cement on the cement article, although I forget what it was before
Adding score stats to the unbelievable truth page
whatever else I come accross. I think this one of the core strengths of wiki - edit when you find errors.