Mention that CURLOPT_MAX_RECV/SEND* were added in 7.15.5

docs/libcurl/curl_easy_setopt.3

@@ -1077,13 +1077,15 @@ Pass a long as parameter. It contains the time in seconds that the transfer
 should be below the \fICURLOPT_LOW_SPEED_LIMIT\fP for the library to consider
 it too slow and abort.
 .IP CURLOPT_MAX_SEND_SPEED_LARGE
-Pass a curl_off_t as parameter.  If an upload exceeds this speed on cumulative 
-average during the transfer, the transfer will pause to keep the average rate 
-less than or equal to the parameter value.  (default: 0, unlimited)
+Pass a curl_off_t as parameter.  If an upload exceeds this speed on cumulative
+average during the transfer, the transfer will pause to keep the average rate
+less than or equal to the parameter value.  Defaults to unlimited
+speed. (Added in 7.15.5)
 .IP CURLOPT_MAX_RECV_SPEED_LARGE
-Pass a curl_off_t as parameter.  If an upload exceeds this speed on cumulative 
-average during the transfer, the transfer will pause to keep the average rate 
-less than or equal to the parameter value.  (default: 0, unlimited)
+Pass a curl_off_t as parameter.  If an upload exceeds this speed on cumulative
+average during the transfer, the transfer will pause to keep the average rate
+less than or equal to the parameter value. Defaults to unlimited speed. (Added
+in 7.15.5)
 .IP CURLOPT_MAXCONNECTS
 Pass a long. The set number will be the persistent connection cache size. The
 set amount will be the maximum amount of simultaneously open connections that