Is there any mermaid specification syntax for directly embedding diagrams into a markdown file (like by flagging the start of the diagram with a special title

Is there any mermaid specification syntax for directly embedding diagrams into a markdown file (like by flagging the start of the diagram with a special title like #### diagramtypename) ? I was poking around the examples and live editor, and it seemed impossible to do except with an image link, which is rather more cumbersome.