Added docstring
Added docstring


Former-commit-id: 7a2b1648ac1ad5e6903e1d14dab04876662ee8c5 [formerly a6a94076db88ed7e7ebc45242d7781f2ed3562f3]
Former-commit-id: 250fa8b1309dcd89494f4ead6a861182fac1aa21
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine