Complete random number exercise

Author: codebyra

Sprint-2/1-key-exercises/4-random.js

@@ -7,3 +7,7 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+// num represents a random whole number between 1 and 100 inclusive.
+// Math.random() generates a random number from 0 up to, but not including, 1.
+// The calculation scales this to the required range, Math.floor() rounds it down,
+// and adding minimum makes the range start at 1.