I think this is something in some assembly formats too? I remember seeing it once and wondering if maybe that's where the idea of ending lines in C with semicolons came from since at least in the examples I saw in school, a large number of lines had trailing comments with a description of what the operation was doing.

IDA uses ; for comments in its disassembler view, but it looks like C-style // single-line comments and /* comment blocks */ are also accepted by certain tools: https://en.wikibooks.org/wiki/X86_Assembly/Comments