-Note that to disable a sidebar for a [[SubPage]] of a page that has a sidebar,
-you can create a sidebar page that is completely empty. This will turn off
-the sidebar altogether.
+Note that to disable a sidebar for a [[ikiwiki/SubPage]] of a page that has
+a sidebar, you can create a sidebar page that is completely empty. This
+will turn off the sidebar altogether.
+
+Warning: Any change to the sidebar will cause a rebuild of the whole wiki,
+since every page includes a copy that has to be updated. This can
+especially be a problem if the sidebar includes an [[ikiwiki/directive/inline]]
+directive, since any changes to pages inlined into the sidebar
+will change the sidebar and cause a full wiki rebuild.
+
+Instead, if you include a [[ikiwiki/directive/map]] directive on the sidebar,
+and it does not use the `show` parameter, only adding or removing pages
+included in the map will cause a full rebuild. Modifying pages will not.