public void add(String word, int number) {
		if (this.words.containsKey(word)) { // If the word has already been added to the inverted file:
			if (! this.words.get(word).contains(number)) { // If the word hasn't already been added from the current document:
				this.words.get(word).add(number); // Add the number of the document to the list for this word
			}
		}

		else { // If the word isn't yet in the inverted file
			this.words.put(word, new LinkedList<Integer> ()); // Add a new list to the HashMap at the word
			this.words.get(word).add(number); // Add the document number to the list just created
		}
	}