diff --git a/book/acknowledgements.md b/book/acknowledgements.md
index 150bdc32b..bae83b618 100644
--- a/book/acknowledgements.md
+++ b/book/acknowledgements.md
@@ -18,7 +18,7 @@ readable because of you all.
 [repo]: https://github.com/munificent/craftinginterpreters
 
 I'm grateful to my copy editor Kari Somerton who braved a heap of computer
-science jargon and an unfamilar workflow in order to fix my many grammar errors
+science jargon and an unfamiliar workflow in order to fix my many grammar errors
 and stylistic inconsistencies.
 
 When the pandemic turned everyone's life upside down, a number of people reached
diff --git a/site/acknowledgements.html b/site/acknowledgements.html
index 9f02491ff..56c22a737 100644
--- a/site/acknowledgements.html
+++ b/site/acknowledgements.html
@@ -85,7 +85,7 @@ <h1 class="part">Acknowledgements</h1>
 code errors, typos, and unclear sentences. The book is more accurate and
 readable because of you all.</p>
 <p>I&rsquo;m grateful to my copy editor Kari Somerton who braved a heap of computer
-science jargon and an unfamilar workflow in order to fix my many grammar errors
+science jargon and an unfamiliar workflow in order to fix my many grammar errors
 and stylistic inconsistencies.</p>
 <p>When the pandemic turned everyone&rsquo;s life upside down, a number of people reached
 out to tell me that my book provided a helpful distraction. This book that I