Use a material tag to identify the type of material used for an element or a layer of an element.
Revit stores this information in the Description field of the Material Editor.
Before using this procedure, load the necessary material tags for those elements that need a tag.
After you place the tag, you can change its orientation by selecting the tag and pressing Spacebar.
You can move the end of the leader to a new material, and the new material will display in the material tag.
If the material tag displays a question mark (?), the Description field of the Identity tab for the element’s material is blank. You can double-click the question mark and enter a description of the material. Revit automatically completes the Description field with this value.