DOC: added comment to remember to check size of output
DOC: added comment to remember to check size of output

Former-commit-id: 070fe9fa18456f5ffaafde1d84c39b99eeaaab49 [formerly caa388a33673a44f7767149ce420df113463c9be]
Former-commit-id: cd2f0dc2cb896609d0a5d318d160a17c225de7ea
Former-commit-id: aabef68f31f42d183e36be984c3685321393017e
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox