diff --git a/README.md b/README.md
index a5648c01..46c2e3af 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,7 @@ In example, to replace inject the value of `process.env.NODE_ENV`:
 
 ```js
 autoPreprocess({
-  replace: ['process.env.NODE_ENV', JSON.stringify(process.env.NODE_ENV)],
+  replace: [['process.env.NODE_ENV', JSON.stringify(process.env.NODE_ENV)]],
 });
 ```