diff --git a/README.md b/README.md
index 20f60249..dfe734d6 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ and exposes the advertised routes of your nodes.
 
 A [Tailscale network (tailnet)](https://tailscale.com/kb/1136/tailnet/) is private
 network which Tailscale assigns to a user in terms of private users or an
-organisations.
+organisation.
 
 ## Design goal