diff --git a/README.md b/README.md
index 23feeda1ea43d95c0c3e1e738815d56815a319aa..4e18c9250dbb451e4bba28c9c6fd9db5517ac8d8 100644
--- a/README.md
+++ b/README.md
@@ -143,6 +143,7 @@ Homebrew build
    brew install speex
    brew install gsl
    brew install libquicktime
+   brew install pkg-config
 </code>
 3. git clone https://git.purrdata.net/jwilkes/purr-data.git
 4. remove plugin from LIB_TARGETS in externals/Makefile