We all know that on Stack Exchange users are required to disclose affiliation with links and potential promotions they post. In case of being unaffiliated, one often writes a "disclaimer". Searching for the word "disclaimer" on Stack Overflow yields some less comprehensible results like this:
disclaimer: I'm the author
There are plenty of other results where something like "I wrote this" follows an opening of "Disclaimer". Is this an appropriate or correct usage?
Yes.
It's short, to the point, and leaves no room for ambiguity; in that answer, it must apply to the preceding link.
Except that this is a community wiki answer, which makes it less clear who the post author is (after all, somebody rewriting the answer could end up being the 'main' author according to the system). Therefore, I tweaked it a bit; it now reads:
(disclaimer: I, @broofa, am the author)
I personally don't see any issues with it. However, if you're uncomfortable with the possible duplicate meaning, you could always use Full Disclosure.
Full disclosure, the acknowledgement of possible conflicts of interest in one's work
For example,
Full Disclosure: I'm the author
