diff --git a/README.md b/README.md
index bed57fa..917cf52 100755
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ You'll need OpenCV 2.3.1 or newer installed before installing node-opencv.
 ## Specific for macOS
 Install OpenCV using brew
 ```bash
+brew install pkg-config
 brew install opencv@2
 brew link --force opencv@2
 ```