I have over 4000 recipes on my computer..all categorized ... more than half came from me or family, the other half Ive copied from web sites or wherever ...each time I use one, I make notes of changes ... most of them I have not even tried...but when looking for ideas as to what to have, great reminders... i use recipes as a guide line any way....dont measure much of anything except when baking ...those are formulas not recipes.. I like to read cookbooks...have about 200 of them....but may or may not try some recipes there....

I don't write things down on recipes. What I generally cook is standard everyday stuff that I modify - spur of the moment.
~ So, having said that, my youngest son wanted my Chili recipe last week. I sat down and came up with the most standard items along with a few twists I like to use (like Cajun spices, a bit of Spanish Smoked Paprika, New Mexican Chili powder, or Californian Chili powder if I want a milder chili...). With my list of standard things I start with, my son proceeded to make a pot of chili. I told him to write down what he does so he can modify it next time as he sees fit. He did.
~ He wrote me back a few hours later with what he had done and one of the things he added was a small handful of semi-sweet chocolate chips - that I always do but forgot to tell him!! He remembered me doing that chocolate chip thing from batches I made when he was growing up - as his grandfather had taught me, he remembered that!

So yeah, write things down.... Don't be like ME!!