diff --git a/cryptographic_rock-paper-scissors.myco b/cryptographic_rock-paper-scissors.myco
index d6e74f0..ca8cf98 100644
--- a/cryptographic_rock-paper-scissors.myco
+++ b/cryptographic_rock-paper-scissors.myco
@@ -1 +1,3 @@
-A perennial problem on the internet in text chat is that a naively implemented Rock-Paper-Scissors game leads to whoever plays a move first winning.
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+A perennial problem on the internet in text chat is that a naively implemented Rock-Paper-Scissors game leads to whoever plays a move first winning, as the winning move given the other player's move is known and fixed. Cryptography solves this: it is possible for each player to commit to a move before revealing it.
+
+== Protocol
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