diff --git a/src/introduction.md b/src/introduction.md
index 11e3bf3..fec5fdc 100644
--- a/src/introduction.md
+++ b/src/introduction.md
@@ -58,7 +58,7 @@ in Rust. If you like it, you might want to check out the others as well:
 
 I'd like to take this chance to thank the people behind `mio`, `tokio`,
 `async_std`, `Futures`, `libc`, `crossbeam` which underpins so much of the
-async ecosystem and and rarely gets enough praise in my eyes.
+async ecosystem and rarely gets enough praise in my eyes.
 
 A special thanks to [jonhoo](https://twitter.com/jonhoo) who was kind enough to
 give me some valuable feedback on a very early draft of this book. He has not