diff --git a/README.md b/README.md
index aff6b7c..54e5961 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,18 @@ On Fedora/RedHat/CentOS you will need the following yum packages to be able to i
 yum install gdal gdal-devel gdal-static proj-devel proj-epsg
 ```
 
+On Mac OS X you will need GDAL e.g. precompiled from here:
+http://www.kyngchaos.com/software/frameworks
+Depending on the version of the OS, you will probably not find a suitable rgdal in CRAN. To install manually:
+- download "package source" from http://cran.r-project.org/web/packages/rgdal/index.html
+- from a terminal:
+```shell
+cd ~/Downloads/
+sudo R CMD INSTALL -configure-args'-with-proj-include=/usr/local/lib' rgdal_0.9-1.tar.gz
+```
+restart R or RStudio
+
+
 Futher user documentation is in the R help and the vignettes:
 
 ```r