diff --git a/doc/02-libraries.md b/doc/02-libraries.md
index c38f9f7f0..f5763b27a 100644
--- a/doc/02-libraries.md
+++ b/doc/02-libraries.md
@@ -123,7 +123,7 @@ We do this by adding a package repository specification to the blog's
                 "type": "vcs",
                 "url": "https://github.com/composer/hello-world"
             }
-        },
+        ],
         "require": {
             "acme/hello-world": "dev-master"
         }