* <tr><td> <usual/aatree.h> </td><td> Binary Tree </td></tr>
* <tr><td> <usual/cbtree.h> </td><td> Crit-Bit Tree </td></tr>
* <tr><td> <usual/hashtab-impl.h> </td><td> Hash table </td></tr>
- * <tr><td> <usual/heap-impl.h> </td><td> Min/Max heap </td></tr>
+ * <tr><td> <usual/heap.h> </td><td> Binary heap </td></tr>
* <tr><td> <usual/list.h> </td><td> Double-linked list </td></tr>
* <tr><td> <usual/mbuf.h> </td><td> Memory buffer </td></tr>
* <tr><td> <usual/mdict.h </td><td> Minimal dict </td></tr>
* <tr><td> <usual/daemon.h> </td><td> Process daemonization </td></tr>
* <tr><td> <usual/err.h> </td><td> Error handling for command-line tools </td></tr>
* <tr><td> <usual/fileutil.h> </td><td> Various file I/O tools </td></tr>
+ * <tr><td> <usual/netdb.h> </td><td> Async DNS lookup </td></tr>
* <tr><td> <usual/logging.h> </td><td> Logging framework for daemons </td></tr>
* <tr><td> <usual/pgsocket.h> </td><td> Async Postgres connection framework </td></tr>
* <tr><td> <usual/safeio.h> </td><td> Safety wrappers around OS I/O </td></tr>