Hook onto an entity's Touch

So first I search for entities to get their position or things from them like[lua]
for k, v in pairs( ents.GetAll() ) do
–other searches
if(v:GetClass() == “m1_c”)then
print(“Found a mc!”)
table.insert(mclist,v)
–[[v:Touch() = function(entity)
print(“mc touched by a(n)”,entity:GetClass())
end]]–
end
end
[/lua] and I would like to know how I could hook onto the entity’s touch hook, like what’s in the comment.

bump