1.4 h: Explainer?

1.4.h Does "explainer" make anyone else uncomfortable?

I added this question, at risk of bringing up something on which there is
already concensus, because I can find no reason not to call a caption a

This is a link caption so call it a "link caption" or if there are reasons
not to use caption, then some of the other common words already used to
describe what it does: "link title" or "link subtitle" 

"Explainer" is in the dictionary, but it sounds weird. 

The Word Electric      \I sing the body electric 	I key the word electric\
POB 177, Route 5       /	-- Walt				-- Liora       /
E. Thetford, VT 05043  \             or, as Henry Miller said,                 \
802/785-2623	       /"Anyone can write, but writers can't do anything else."\