Added comment [demos][skip hazardlib]
Added comment [demos][skip hazardlib]


Former-commit-id: e563f384772cb59589c536b5c3dc844589407f8e [formerly 08991fe86e5785f2bedfabb9a36058f8bc37bd6f]
Former-commit-id: d9dc55595fba4eaf41561aede89a115aad0653ed
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine