diff --git a/README.md b/README.md
index 740de1a..6311518 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ The "Notes on OpenPGP" project aims to produce accessible documentation for the
 
 A book for application developers who want to integrate OpenPGP functionality into their software.
 
-This book serves a standalone introduction to the concepts of OpenPGP. It also introduces readers to the [OpenPGP RFC](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/).
+This book serves as a standalone introduction to the concepts of OpenPGP. It also introduces readers to the [OpenPGP RFC](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/).
 
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