Added a docstring
Added a docstring


Former-commit-id: 1d84190bcb2047b23dacb8361e1a7dab66e948b3 [formerly 4a91243cff0ddd2cb567201aaed115a36b2fac43]
Former-commit-id: 2aded131ae82d792eb558dc7398e528904c68791
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine