-these in `/usr/lib/ikiwiki/plugins` by default. If `libdir` is set, it will
-also look under that directory, for example in `/home/you/.ikiwiki/plugins`.
+these in `/usr/lib/ikiwiki/plugins` by default. If `libdirs` or `libdir` are
+set, it will also look under those directories, for example in
+`/home/you/.ikiwiki/plugins`.