diff --git a/examples/requirements.txt b/examples/requirements.txt
index f06cef4..991b7dd 100644
--- a/examples/requirements.txt
+++ b/examples/requirements.txt
@@ -17,6 +17,13 @@ Sphinx==1.3.3
 sphinx-rtd-theme==0.1.9
 zope.interface==4.2.0
 
+# Examples from PEP508
+# c.f. https://www.python.org/dev/peps/pep-0508/
+requests [security,tests] >= 2.8.1, == 2.8.* ; python_version < "2.7"
+pip @ https://github.com/pypa/pip/archive/1.3.1.zip#sha1=da9234ee9982d4bbb3c72346a6de940a148ea686
+name @ gopher:/foo/com"
+foobar[quux]<2,>=3; os_name=='a'
+
 # VCS repositories
 [-e] git+git://git.myproject.org/MyProject#egg=MyProject # Git
 [-e] git://git.myproject.org/MyProject.git@v1.0#egg=MyProject