diff --git a/proposals/0064-transaction-receipt.md b/proposals/0064-transaction-receipt.md
index 7f918fa7e..a7e781f2f 100644
--- a/proposals/0064-transaction-receipt.md
+++ b/proposals/0064-transaction-receipt.md
@@ -234,7 +234,7 @@ It is designed to feature the following properties:
   thereby making it deterministic and immalleable.
 
 - The order of the leaf nodes matches the block's transaction order.
-  (As it unamiguously appears in the PoH construction)
+  (As it unambiguously appears in the PoH construction)
 
 - Succinct inclusion proofs are constructed by providing a hash path
   from a leaf node to the root node. The inclusion proof format is defined