diff --git a/requirements-docs.txt b/requirements-docs.txt
new file mode 100644
index 0000000..ca85cf0
--- /dev/null
+++ b/requirements-docs.txt
@@ -0,0 +1,3 @@
+# Requirements for building py-wsse docs
+
+Sphinx>=1.3.1
diff --git a/requirements.txt b/requirements.txt
index b6f4682..3cf3355 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,6 @@ tox>=2.1.1
 pytest>=2.7.2
 coverage>=3.7.1
 
-Sphinx>=1.3.1
-
 flake8>=2.4.1
+
+-r requirements-docs.txt