add missing docstring
add missing docstring

Akasurde/pytest,txomon/pytest,alfredodeza/pytest,markshao/pytest,The-Compiler/pytest,tomviner/pytest,RonnyPfannschmidt/pytest,pytest-dev/pytest,nicoddemus/pytest,nicoddemus/pytest,hackebrot/pytest,ddboline/pytest,The-Compiler/pytest,pfctdayelise/pytest,tomviner/pytest