-expands to "Proxmox VE". The plan is to add more such definitions for
-terms which are used more than once.
+expands to "Proxmox VE".
+
+For URLs which are used more than once, two macros should be defined:
+
+* `{name-url}`, which just contains the http(s) URL
+* `{name}`, which contains the complete link including the canonical
+description
+
+For example, the macro `{forum-url}` expands to {forum-url}, and the macro
+`{forum}` expands to {forum}.
+
+The plan is to add more such definitions for terms which are used more than once.
+
+WARNING: When asciidoc encounters a misspelled macro name, it will silently drop
+the containing line!
+
+WARNING: Never use macros in document titles or the ``NAME'' section of man pages,
+as these get parsed before the `attributes.txt` file gets included.