Full Idea
'Truth supervenes on being' says that any two possible worlds alike with respect to what entities exist and which properties (and relations) each of those entities exemplifies are thereby alike with respect to what is true.
Gist of Idea
If 'truth supervenes on being', worlds with the same entities, properties and relations have the same truths
Source
Trenton Merricks (Truth and Ontology [2007], 4)
Book Reference
Merricks,Trenton: 'Truth and Ontology' [OUP 2007], p.68
A Reaction
Merricks says this view is found in early Wittgenstein, as well as in David Lewis. He suggests that this is a weaker and more plausible thesis than the full commitment to truthmakers. It still allows some truths to lack truthmakers. Sounds plausible.