diff --git a/bsip-0033.md b/bsip-0033.md
index a2dff50..06d5409 100644
--- a/bsip-0033.md
+++ b/bsip-0033.md
@@ -43,7 +43,7 @@ matched with a maker limit order which is not on the top of the order book.
 
 Make the exchange system more user-friendly.
 
-# Rational
+# Rationale
 
 To attract more users, the system should be fair.