Important note missing from WireSend wiki page

In the source code of the Wire library (spamproofwiki://code.google.com/p/arduino/source/browse/trunk/libraries/Wire/Wire.cpp#128) it is mentioned in a header comment that send() "must be called in: slave tx event callback" but the WireSend page of the Arduino wiki (spamproofwiki://arduino.cc/en/Reference/WireSend) makes no mention of it. Please add a comment to that page about this, because it can cause a serious headache to debug a sketch without this knowledge.