diff --git a/docs/ref/contrib/gis/install.txt b/docs/ref/contrib/gis/install.txt
index a5c87864c9..9cb945f76a 100644
--- a/docs/ref/contrib/gis/install.txt
+++ b/docs/ref/contrib/gis/install.txt
@@ -938,7 +938,7 @@ Summary::
     $ sudo port install geos
     $ sudo port install proj
     $ sudo port install postgis
-    $ sudo port install gdal
+    $ sudo port install gdal +geos
     $ sudo port install libgeoip
 
 .. note::