fix typo
diff --git a/README.md b/README.md
index 3326f81..baf8862 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@
 ```
 
 This will generate the `ninja` binary and a `build.ninja` file you can now use
-to built Ninja with itself.
+to build Ninja with itself.
 
 ### CMake