diff --git a/docs/chat/introduction.md b/docs/chat/introduction.md
index ffbfa341..024d2af8 100644
--- a/docs/chat/introduction.md
+++ b/docs/chat/introduction.md
@@ -19,5 +19,5 @@ This exchange (documented in further detail in [authentication protocol](https:/
 i.e. it is possible for any party to forge transcripts of this protocol exchange after the fact, and as such - after the
 fact - it is impossible to definitely prove that the exchange happened at all.
 
-One the authentication process is successful then both you and your friend can communicate away assured that no one else
+Once the authentication process is successful then both you and your friend can communicate away assured that no one else
 can learn anything about the contents or the metadata if your conversation.