diff --git a/book/src/introduction.md b/book/src/introduction.md
index 11eda9e..d336537 100644
--- a/book/src/introduction.md
+++ b/book/src/introduction.md
@@ -20,7 +20,7 @@ Data format and schema, with a type system as strong as Rust's.
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-As the name suggests, STEF is a data encoding format, that borrows a lot from existing formats like [Protobuf](https://protobuf.dev), [Cap'n Proto](https://capnproto.org) and [Flatbuffers](https://flatbuffers.org), but in contrast vastly extends the type system to make it as strong as Rust's.
+As the name suggests, STEF is a data encoding format, that borrows a lot from existing formats like [Protobuf](https://protobuf.dev), [Cap'n Proto](https://capnproto.org) and [Flatbuffers](https://flatbuffers.dev), but in contrast vastly extends the type system to make it as strong as Rust's.
 
 ## Why a stronger type system?