16.5 Maintaining comments: check the diffs 维护注释：检查差异

One good way to make sure documentation stays up to date is to take a few minutes before committing a change to your revision control system to scan over all the changes for that commit; make sure that each change is properly reflected in the documentation. These pre-commit scans will also detect several other problems, such as accidentally leaving debugging code in the system or failing to fix TODO items.

确保文档保持最新状态的一种好方法是，在将更改提交到修订控制系统之前需要花费几分钟，以扫描该提交的所有更改。确保文档中正确反映了每个更改。这些预先提交的扫描还将检测其他一些问题，例如意外地将调试代码留在系统中或无法修复 TODO 项目。