Added a docstring
Added a docstring


Former-commit-id: 4330f07ec2e5332c543308e01141e9beb5f12de9 [formerly 8d97db85d77e314c1902d1d1ba51abb4533d0157]
Former-commit-id: 04ba6022b998601fef1bd3faf5640f55f1f4ee33
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine