A log file is automatically created when running a pipeline on matchms. This log file gives an overview of all the settings and filters used, followed by logging of changes to individual spectra. The logging can be set to different logging levels. To give a clear overview of what changes were made to a mass spectral library, a processing report is generated. This report gives an overview of the number of spectra that were changed in the library by each filter. In this report we differentiate between completely removing spectra, changing the metadata, and changing the peak information. Examples of automatically generated processing reports for library cleaning pipelines can be found in Tables and.