-/* USE_5005THREADS:
- * This symbol, if defined, indicates that Perl should be built to
- * use the 5.005-based threading implementation.
- * Only valid up to 5.8.x.
+/* USE_THREADS:
+ * This symbol, if defined, indicates that Perl should
+ * be built to use threads. At present, it is a synonym for
+ * and USE_ITHREADS, but eventually the source ought to be
+ * changed to use this to mean _any_ threading implementation.