- /* If the type is PTR, we have to construct the relevant magic lookup
- key. This code is now in a separate function. */
+ /* If the type is PTR, we have to construct the relevant magic lookup key if
+ the original is an IP address (some experimental protocols are using PTR
+ records for different purposes where the key string is a host name). This
+ code for doing the reversal is now in a separate function. */