Simple past tense and past participle of document.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "documented" in a sentence
"They're going to be assisting us in creating what we call the documented picture of where the bridge actually -- what it looked like, so that we can bring this back and create the appropriate computer model."
"One thing that has been well documented is that El-Nino winters like this one produce heavier than normal snowfall over the eastern 2/3 of the US."
"Ezra Klein documented it all fairly closely, with quotes from administration officials underlying his reporting."