============ Introduction ============ EHT-HOPS (or *ehthops*) is a data calibration pipeline that uses the Haystack Observatory Preprocessing System (HOPS) and the EHT Analysis Toolkit (EAT) to reduce data from millimetre Very Long Baseline Interferometry (mm-VLBI) observations. For details, refer to `Blackburn et al. (2019) `_. This documentation explains the steps necessary to install and run the ehthops pipeline.