Add description about partial WAL archiving for PITR:

>
>   Doing this will allow administrators to know more easily when the
>   archive contins all the files needed for point-in-time recovery.

doc/TODO

@@ -2,7 +2,7 @@
 TODO list for PostgreSQL
 ========================
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
-Last updated:		Sun Apr 17 23:17:13 EDT 2005
+Last updated:		Mon Apr 18 08:51:13 EDT 2005
 
 The most recent version of this document can be viewed at the PostgreSQL web
 site, http://www.PostgreSQL.org.
@@ -113,6 +113,10 @@ Administration
 
 * Force archiving of partially-full WAL files when pg_stop_backup() is
   called or the server is stopped
+
+  Doing this will allow administrators to know more easily when the
+  archive contins all the files needed for point-in-time recovery.
+
 * Create dump tool for write-ahead logs for use in determining
   transaction id for point-in-time recovery
 * Set proper permissions on non-system schemas during db creation