mention --trace and --trace-ascii in the -v/--versbose section to remind

people how to get even more details shown

docs/curl.1

@@ -621,6 +621,9 @@ info provided by curl.
 Note that if you want to see HTTP headers in the output, \fI-i/--include\fP
 might be option you're looking for.
 
+If you think this option still doesn't give you enough details, consider using
+\fI--trace\fP or \fI--trace-ascii\fP instead.
+
 If this option is used twice, the second will again disable verbose.
 .IP "-V/--version"
 Displays the full version of curl, libcurl and other 3rd party libraries