diff --git a/dev-requirements.txt b/.virtualenv.dev-requirements.txt
similarity index 95%
rename from dev-requirements.txt
rename to .virtualenv.dev-requirements.txt
index 62708ab5..77dd92d5 100644
--- a/dev-requirements.txt
+++ b/.virtualenv.dev-requirements.txt
@@ -8,7 +8,7 @@
 # After activation of the env, install it with:
 # $ pip install -r dev-requirements.txt
 
--r requirements.txt
+-r .virtualenv.requirements.txt
 
 # virtualenv-based automation of test activities
 tox
diff --git a/requirements.txt b/.virtualenv.requirements.txt
similarity index 100%
rename from requirements.txt
rename to .virtualenv.requirements.txt
diff --git a/MANIFEST.in b/MANIFEST.in
index d85ef3bd..25bf19e7 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,4 @@
-#
-#
-#
+# Manifest describing source package contents
 
 graft boot
 graft config
@@ -19,6 +17,7 @@ include .landscape.yml
 include .travis*
 include .releasetags
 
-include *requirements.txt
+include .virtualenv.requirements.txt
+include .virtualenv.dev-requirements.txt
 
 global-exclude *.py[cod] __pycache__ *.so *.dylib