diff --git a/main.cpp b/main.cpp
index b9d49d3..87fd02e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,11 +1,3 @@
-//
-//  main.cpp
-//  ranlin
-//
-//  Created by Bob Polis on 05-03-15.
-//  Copyright (c) 2015 Thalictrum. All rights reserved.
-//
-
 #include <iostream>
 #include <fstream>
 #include <string>
@@ -20,9 +12,13 @@ double next_random() {
 }
 
 string random_line_from_file(istream& file) {
+    // This function selects a line from a file by reading
+    // the file line by line, so the file is never in memory
+    // as a whole. Still, the chance a line is being picked
+    // is equal for every line.
     string line;
     string result;
-    for (int nr {1}; getline(file, line); ++nr) {
+    for (int nr = 1; getline(file, line); ++nr) {
         if (next_random() * nr < 1.0) {
             result = line;
         }