The domain of comonotonically additive and monotone functionals on the clas
s of continuous functions with compact support is extended in a natural way
. A necessary and sufficient condition for which the extended functional is
comonotonically additive and monotone is presented. It is shown that the e
xtended functional can be represented by a Choquet integral when the extend
ed functional is comonotonically additive and monotone, (C) 2001 Elsevier S
cience B.V. All rights reserved.