diff --git a/2016/ruby/day_15.rb b/2016/ruby/day_15.rb
index 36b9ae0..d7288d1 100644
--- a/2016/ruby/day_15.rb
+++ b/2016/ruby/day_15.rb
@@ -8,6 +8,7 @@ discs = DATA.each_line.map {|line|
   /Disc #\d has (?<positions>\d+) positions; at time=0, it is at position (?<position>\d+)./ =~ line
   Disc.new(positions.to_i, position.to_i)
 }
+discs << Disc.new(11, 0)
 
 p (0..Float::INFINITY).find {|t|
   discs.each.with_index.all? {|disc, index|
@@ -16,5 +17,9 @@ p (0..Float::INFINITY).find {|t|
 }
 
 __END__
-Disc #1 has 5 positions; at time=0, it is at position 4.
-Disc #2 has 2 positions; at time=0, it is at position 1.
+Disc #1 has 17 positions; at time=0, it is at position 15.
+Disc #2 has 3 positions; at time=0, it is at position 2.
+Disc #3 has 19 positions; at time=0, it is at position 4.
+Disc #4 has 13 positions; at time=0, it is at position 2.
+Disc #5 has 7 positions; at time=0, it is at position 2.
+Disc #6 has 5 positions; at time=0, it is at position 0.