Hello,
I'm learning the reference guide (english) document, in section 1.6.1, the sample diagram is not correct, as it's not shown the MessageBelowArrow.
It should be like this:
https://github.com/yasenstar/PlantUML_in_Action/blob/main/01_sequence_diagram/01.01-01.10/01_06_2.png
Could you check? Thanks.
Xiaoqi