add bento to build docs

doc/source/install.txt

@@ -59,4 +59,32 @@ in-place::
 
   python setup.py build_ext -i
 
+In addition you can install using 
+`bento`<http://cournape.github.io/Bento/>_. However Bento requires
+you install it, as well as link to WAFLIB which is part of 
+`Waf`<https://code.google.com/p/waf/>_.
+
+To install bento follow the instructions on the webpage, then link
+to WAF by adding::
+
+export WAFLIB=<the/path/to/your/installation/of/waf>
+
+e.g. WAFLIB=/usr/local/src/waf
+
+then install scikit learn by going to the scikit-image directory
+and typing::
+
+bentomaker install
+
+or if you want to use multiple cores::
+
+bentomaker configure
+bentomaker build  -j <# of cores> -i (if you want to build it inplace)
+bentomaker install
+
+Depending on the permissions of your /usr/local/ dir you might need
+to put a sudo before the ``bentomaker install`` so that
+scikit-image can put ``skivi`` there, which is used for image
+viewing by ``skimage.io.imshow``. 
+ 
 .. include:: ../../DEPENDS.txt