Update checklength

pymavlink/generator/C/include_v1.0/mavlink_helpers.h

@@ -229,6 +229,12 @@ MAVLINK_HELPER uint8_t mavlink_parse_char(uint8_t chan, uint8_t c, mavlink_messa
 #endif
 #endif
 
+/* Enable this option to check the length of each message.
+ This allows invalid messages to be caught much sooner. Use if the transmission
+ medium is prone to missing (or extra) characters (e.g. a radio that fades in
+ and out). Only use if the channel will only contain messages types listed in
+ the headers.
+*/
 #if MAVLINK_CHECK_MESSAGE_LENGTH
 #ifndef MAVLINK_MESSAGE_LENGTH
 	static const uint8_t mavlink_message_lengths[256] = MAVLINK_MESSAGE_LENGTHS;