Add note about max parameter to random() reference page

Closes #70

Author: per1234

Language/Functions/Random Numbers/random.adoc

@@ -85,6 +85,8 @@ void loop() {
 If it is important for a sequence of values generated by `random()` to differ, on subsequent executions of a sketch, use `randomSeed()` to initialize the random number generator with a fairly random input, such as `analogRead()` on an unconnected pin.
 
 Conversely, it can occasionally be useful to use pseudo-random sequences that repeat exactly. This can be accomplished by calling `randomSeed()` with a fixed number, before starting the random sequence.
+
+The `max` parameter should be chosen according to the data type of the variable in which the value is stored. In any case, the absolute maximum is bound to the `long` nature of the value generated (32 bit - 2,147,483,647). Setting `max` to a higher value won't generate an error during compilation, but during sketch execution the numbers generated will not be as expected.
 [%hardbreaks]
 
 [float]