If a file in the srcdir is removed, exposing a file in the underlaydir,
-ikiwiki will not notice the change and rebuild it until the file in the
-underlaydir gets a mtime newer than the mtime the removed file had.
+ikiwiki will notice the removal and delete the page from the destdir. The
+page from the underlay will not be built. (However, it will be if the wiki
+gets rebuilt.)