diff --git a/README.md b/README.md
index 128ecd8..65f0b13 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ sudo port install autoconf
 sudo port install libtool
 sudo port install automake
 sudo port install wget
+sudo port install gsed
 ```
 
 Install Xcode (if not installed already)