Added docstring [skip CI]
Added docstring [skip CI]


Former-commit-id: c4a33f74d7ff4204cd3741124643469b50fa59f7 [formerly e28987b70eb251b5cc08123789429c413a63c9f3]
Former-commit-id: c0fb373dc992c9b10d8baff868c31d274184617b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine