-have to (well, *should*) use underscores in place of spaces is so that
-`ikiwiki` can distinguish your WikiLink from a PreprocessorDirective.
+**have to use underscores in place of spaces in WikiLinks** is so that
+`ikiwiki` can distinguish your WikiLink from a PreProcessorDirective.
+
+(Note: previously, you could actually use spaces if you specify the target
+link following the pipe symbol (`|`), as in the above, but this has been
+disabled shortly after version 2.8).