Updated Cygwin section with possibly missing package.
diff --git a/README.mdown b/README.mdown
index eb619be..5bab435 100644
--- a/README.mdown
+++ b/README.mdown
@@ -49,6 +49,13 @@
$ wget -q -O - https://github.com/nvie/gitflow/raw/develop/contrib/gitflow-installer.sh | bash
+If you get the error "flags: FATAL unable to determine getopt version" error after
+
+ $ git flow init
+
+you need to install the util-linux package using the Cygwin setup.
+
+
#### Using [msysgit](http://code.google.com/p/msysgit/)
Download and install `getopt.exe` from the [util-linux package](http://gnuwin32.sourceforge.net/packages/util-linux-ng.htm) into `C:\Program Files\Git\bin`. (Only `getopt.exe`, the others util-linux files are not used). Also install `libintl3.dll` from the Dependencies package, into the same directory.