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I write a quick note to correct what is probably an editing error. Both the abstract and the text state that under-five mortality has increased in sub-Saharan Africa 1990-2018, while decreasing in the rest of the world. In fact, the Unicef data referenced in the paper (https://data.unicef.org/topic/child-survival/under-five-mortality/) indicate that under five mortality has decreased from 178 per 1000 live births in 1990 to 78 per 1000 in 2018, a reduction of 100 per 1000 or 56%. The UN inter-agency group for child mortality estimation (IGME) has similar estimates (https://childmortality.org/data/SDG%20Regions%20%3E%20Sub-Saharan%20Africa).