diff --git a/doc/guides/building-node-with-ninja.md b/doc/guides/building-node-with-ninja.md
index 4391d56bdbc..ba495278ba3 100644
--- a/doc/guides/building-node-with-ninja.md
+++ b/doc/guides/building-node-with-ninja.md
@@ -2,7 +2,7 @@
 
 The purpose of this guide is to show how to build Node.js using [Ninja][], as
 doing so can be significantly quicker than using `make`. Please see
-[Ninja's site][Ninja] for installation instructions (unix only).
+[Ninja's site][Ninja] for installation instructions (Unix only).
 
 To build Node.js with ninja, there are 3 steps that must be taken: