By default, the preferences are set up so that Developer Comment nodes appear under the nodes in the interface that needs comments. To show User Documentation open the Preferences dialog box and select All from the Show documentation list under the Comments and documentation section of the Physics Builder page. It is also possible to change this setting by clicking the Show menu () in the Physics Builder window and selecting Show All Documentation from the Documentation menu. For the user documentation, a default User Documentation text node is added automatically under the main User Documentation node, but you can add any other documentation components such as equations, images, notes, and tables. The User Documentation nodes appear under the nodes in the interface that needs documentation. The main User Documentation node adds a heading and the topic description used for the context help when clicking the node in the COMSOL Desktop.

When you have created the documentation contents, right-click the main Physics Interface node and select Compile Documentation () to compile the documentation from the various User Documentation nodes into a complete document that appears under the Documentation node () at the bottom of the tree in the Physics Builder window. Under Documentation you can add additional documentation components to describe parts of the physics that are not directly connected to the nodes for the interface such as an introduction or a theory section.