Explain card size

README.md

@@ -19,3 +19,17 @@ and once cutting only the circles.
 We colored the bands on the player and weapon cards 
 using some colored pencils,
 and my daughter drew furniture in the rooms and on the room cards.
+
+# Why tiny cards?
+
+Cheapass Games made a fun game called "Kill Doctor Lucky"
+which uses tiny cards.
+
+This game is,
+as of this writing,
+offered for free download from the
+Crab Fragment Labs game preserve.
+
+I actually made the 4x4 template to print this game out.
+I thought it would be cute to have the detective game
+use the same size cards as the murder game.