Correction

In an article on thrombocytosis (BMJ 2019;366:l4183 doi:10.1136/bmj.l4183), the caption to figure 2 was incorrect, and should have read as follows:

Fig 2 Blood films in a patient with a myeloproliferative neoplasm (a) and in a patient with a reactive thrombocytosis (b). In (a) the platelets are abnormally large, but in (b) the platelets appear normal

An updated version of the article is available on bmj.com.