At /packets, return 10 records by default and add n=x to return x packets.

README.md

@@ -17,8 +17,9 @@ You can use screen to detach the session.
 3. Access the API from whatever other system you want.
 
 ## Endpoints:
--`/packets` - gives the most recent packets, with the fields from the Dire Wolf
-User Guide.
+-`/packets` - gives the most recent packets, sorted descending by time received.
+    - argument `n` will return a specific number of packets, default 10. E.g.,
+    `https://digi.w1cdn.net/aprs_api/packets?n=1` returns one packet.
 
 Example of an object packet sent by W1CDN-1 and digipeated by K0UND-2:
 ```