diff --git a/preface.asciidoc b/preface.asciidoc
index 6f34277f..36579b4a 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -50,7 +50,7 @@ This book is available on GitHub, as a repository that contains the text, images
 
 https://github.com/aantonop/bitcoinbook
 
-Fork the book code, try the code examples, or submit corrections via Github. 
+Fork the book code, try the code examples, or submit corrections via GitHub. 
 
 === Code Examples