- * The transform capability mask is a set of bits, one for each
- * transform supported. The transform capability numbers are set in
- * the configuration (and should correspond between the two sites),
- * although there are sensible defaults.
+ * The capability mask is a set of bits, one for each optional feature
+ * supported. The capability numbers for transforms are set in the
+ * configuration (and should correspond between the two sites), although
+ * there are sensible defaults.