diff --git a/doc/install/OSX.mdwn b/doc/install/OSX.mdwn
index e7bb763937..ba10071a16 100644
--- a/doc/install/OSX.mdwn
+++ b/doc/install/OSX.mdwn
@@ -7,6 +7,7 @@ sudo cabal install pcre-light
 sudo cabal install quickcheck  
 sudo cabal install SHA
 sudo cabal install dataenc
+sudo cabal install hS3   # stub S3 class (used if you don't have hS3 installed) has a bug, so you want to install this
 
 # optional: this will enable the gnu tools, (to give sha224sum etc..., it does not override the BSD userland)
 export PATH=$PATH:/opt/local/libexec/gnubin