diff --git a/README.md b/README.md
index fbe90f2..e245359 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 This repository contains "ADS-B Out" encoder for Tx-capable SDR hardware.
 
-It is currently written is architecture independent Python language and can be used as an add-on for existing
+It is currently written in architecture independent Python language and can be used as an add-on for existing
 open source "ADS-B In" solutions. One known good example is [Stratux](https://github.com/cyoung/stratux).
 
 ## Disclaimer