diff --git a/README.md b/README.md
index 04345a8..ce51ad2 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ a_partner = Partner(
 
 ### Sending a message to your partner
 
-* The partner is now setup we can build and AS2 message
+* The partner is now setup we can build an AS2 message
 ```python
 from pyas2lib.as2 import Message