diff --git a/DEPENDS.txt b/DEPENDS.txt
index 2130e21d..2c2aeb7d 100644
--- a/DEPENDS.txt
+++ b/DEPENDS.txt
@@ -56,3 +56,10 @@ Testing requirements
       A Python Unit Testing Framework
 * `Coverage.py <http://nedbatchelder.com/code/coverage/>`__
       A tool that generates a unit test code coverage report
+
+
+Documentation requirements
+--------------------------
+
+`sphinx >= 1.3 <http://sphinx-doc.org/>`_ is required to build the
+documentation.
diff --git a/doc/README.md b/doc/README.md
index d9fec89a..d11b92dd 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -2,7 +2,7 @@
 To build docs, run `make` in this directory. `make help` lists all targets.
 
 ## Requirements ##
-Sphinx and Latex is needed to build doc.
+Sphinx (>= 1.3) and Latex is needed to build doc.
 
 **Sphinx:**
 ```sh