diff --git a/README.md b/README.md
index b8a5ccd..646cd2b 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,6 @@ If you can serialize a board game, you can do cool stuff:
 2. Record games played over time
 3. Learn patterns from previous games
 
-This tries not to introduce players into the state itself, instead use markers to keep track of where everything is. Built using Cap'n Proto. The game rules themselves are not part of this.
+This tries not to introduce players into the state itself, instead use markers to keep track of where everything is. Built using Cap'n Proto. The game rules themselves are not part of this, and game validations are optional.
+
+For eg, having a chess serialization that allows for 2 kings is _okay_, since the game's logic would never allow it to reach such a state.
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